summaryrefslogtreecommitdiff
path: root/src/drawscreen.c
blob: 17a385c9244c6b3677d5897545733b9a4cd99629 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
/* vi:set ts=8 sts=4 sw=4 noet:
 *
 * VIM - Vi IMproved	by Bram Moolenaar
 *
 * Do ":help uganda"  in Vim to read copying and usage conditions.
 * Do ":help credits" in Vim to see a list of people who contributed.
 * See README.txt for an overview of the Vim source code.
 */

/*
 * drawscreen.c: Code for updating all the windows on the screen.
 * This is the top level, drawline.c is the middle and screen.c the lower
 * level.
 *
 * update_screen() is the function that updates all windows and status lines.
 * It is called form the main loop when must_redraw is non-zero.  It may be
 * called from other places when an immediate screen update is needed.
 *
 * The part of the buffer that is displayed in a window is set with:
 * - w_topline (first buffer line in window)
 * - w_topfill (filler lines above the first line)
 * - w_leftcol (leftmost window cell in window),
 * - w_skipcol (skipped window cells of first line)
 *
 * Commands that only move the cursor around in a window, do not need to take
 * action to update the display.  The main loop will check if w_topline is
 * valid and update it (scroll the window) when needed.
 *
 * Commands that scroll a window change w_topline and must call
 * check_cursor() to move the cursor into the visible part of the window, and
 * call redraw_later(VALID) to have the window displayed by update_screen()
 * later.
 *
 * Commands that change text in the buffer must call changed_bytes() or
 * changed_lines() to mark the area that changed and will require updating
 * later.  The main loop will call update_screen(), which will update each
 * window that shows the changed buffer.  This assumes text above the change
 * can remain displayed as it is.  Text after the change may need updating for
 * scrolling, folding and syntax highlighting.
 *
 * Commands that change how a window is displayed (e.g., setting 'list') or
 * invalidate the contents of a window in another way (e.g., change fold
 * settings), must call redraw_later(NOT_VALID) to have the whole window
 * redisplayed by update_screen() later.
 *
 * Commands that change how a buffer is displayed (e.g., setting 'tabstop')
 * must call redraw_curbuf_later(NOT_VALID) to have all the windows for the
 * buffer redisplayed by update_screen() later.
 *
 * Commands that change highlighting and possibly cause a scroll too must call
 * redraw_later(SOME_VALID) to update the whole window but still use scrolling
 * to avoid redrawing everything.  But the length of displayed lines must not
 * change, use NOT_VALID then.
 *
 * Commands that move the window position must call redraw_later(NOT_VALID).
 * TODO: should minimize redrawing by scrolling when possible.
 *
 * Commands that change everything (e.g., resizing the screen) must call
 * redraw_all_later(NOT_VALID) or redraw_all_later(CLEAR).
 *
 * Things that are handled indirectly:
 * - When messages scroll the screen up, msg_scrolled will be set and
 *   update_screen() called to redraw.
 */

#include "vim.h"

static void win_update(win_T *wp);
#ifdef FEAT_STL_OPT
static void redraw_custom_statusline(win_T *wp);
#endif
#if defined(FEAT_SEARCH_EXTRA) || defined(FEAT_CLIPBOARD)
static int  did_update_one_window;
#endif

/*
 * Based on the current value of curwin->w_topline, transfer a screenfull
 * of stuff from Filemem to ScreenLines[], and update curwin->w_botline.
 * Return OK when the screen was updated, FAIL if it was not done.
 */
    int
update_screen(int type_arg)
{
    int		type = type_arg;
    win_T	*wp;
    static int	did_intro = FALSE;
#ifdef FEAT_GUI
    int		did_one = FALSE;
    int		did_undraw = FALSE;
    int		gui_cursor_col = 0;
    int		gui_cursor_row = 0;
#endif
    int		no_update = FALSE;

    // Don't do anything if the screen structures are (not yet) valid.
    if (!screen_valid(TRUE))
	return FAIL;

    if (type == VALID_NO_UPDATE)
    {
	no_update = TRUE;
	type = 0;
    }

#ifdef FEAT_EVAL
    {
	buf_T *buf;

	// Before updating the screen, notify any listeners of changed text.
	FOR_ALL_BUFFERS(buf)
	    invoke_listeners(buf);
    }
#endif

#ifdef FEAT_DIFF
    // May have postponed updating diffs.
    if (need_diff_redraw)
	diff_redraw(TRUE);
#endif

    if (must_redraw)
    {
	if (type < must_redraw)	    // use maximal type
	    type = must_redraw;

	// must_redraw is reset here, so that when we run into some weird
	// reason to redraw while busy redrawing (e.g., asynchronous
	// scrolling), or update_topline() in win_update() will cause a
	// scroll, the screen will be redrawn later or in win_update().
	must_redraw = 0;
    }

    // May need to update w_lines[].
    if (curwin->w_lines_valid == 0 && type < NOT_VALID
#ifdef FEAT_TERMINAL
	    && !term_do_update_window(curwin)
#endif
		)
	type = NOT_VALID;

    // Postpone the redrawing when it's not needed and when being called
    // recursively.
    if (!redrawing() || updating_screen)
    {
	redraw_later(type);		// remember type for next time
	must_redraw = type;
	if (type > INVERTED_ALL)
	    curwin->w_lines_valid = 0;	// don't use w_lines[].wl_size now
	return FAIL;
    }
    updating_screen = TRUE;

#ifdef FEAT_PROP_POPUP
    // Update popup_mask if needed.  This may set w_redraw_top and w_redraw_bot
    // in some windows.
    may_update_popup_mask(type);
#endif

#ifdef FEAT_SYN_HL
    ++display_tick;	    // let syntax code know we're in a next round of
			    // display updating
#endif
    if (no_update)
	++no_win_do_lines_ins;

    // if the screen was scrolled up when displaying a message, scroll it down
    if (msg_scrolled)
    {
	clear_cmdline = TRUE;
	if (msg_scrolled > Rows - 5)	    // clearing is faster
	    type = CLEAR;
	else if (type != CLEAR)
	{
	    check_for_delay(FALSE);
	    if (screen_ins_lines(0, 0, msg_scrolled, (int)Rows, 0, NULL)
								       == FAIL)
		type = CLEAR;
	    FOR_ALL_WINDOWS(wp)
	    {
		if (wp->w_winrow < msg_scrolled)
		{
		    if (W_WINROW(wp) + wp->w_height > msg_scrolled
			    && wp->w_redr_type < REDRAW_TOP
			    && wp->w_lines_valid > 0
			    && wp->w_topline == wp->w_lines[0].wl_lnum)
		    {
			wp->w_upd_rows = msg_scrolled - W_WINROW(wp);
			wp->w_redr_type = REDRAW_TOP;
		    }
		    else
		    {
			wp->w_redr_type = NOT_VALID;
			if (W_WINROW(wp) + wp->w_height + wp->w_status_height
							       <= msg_scrolled)
			    wp->w_redr_status = TRUE;
		    }
		}
	    }
	    if (!no_update)
		redraw_cmdline = TRUE;
	    redraw_tabline = TRUE;
	}
	msg_scrolled = 0;
	need_wait_return = FALSE;
    }

    // reset cmdline_row now (may have been changed temporarily)
    compute_cmdrow();

    // Check for changed highlighting
    if (need_highlight_changed)
	highlight_changed();

    if (type == CLEAR)		// first clear screen
    {
	screenclear();		// will reset clear_cmdline
	type = NOT_VALID;
	// must_redraw may be set indirectly, avoid another redraw later
	must_redraw = 0;
    }

    if (clear_cmdline)		// going to clear cmdline (done below)
	check_for_delay(FALSE);

#ifdef FEAT_LINEBREAK
    // Force redraw when width of 'number' or 'relativenumber' column
    // changes.
    if (curwin->w_redr_type < NOT_VALID
	   && curwin->w_nrwidth != ((curwin->w_p_nu || curwin->w_p_rnu)
				    ? number_width(curwin) : 0))
	curwin->w_redr_type = NOT_VALID;
#endif

    // Only start redrawing if there is really something to do.
    if (type == INVERTED)
	update_curswant();
    if (curwin->w_redr_type < type
	    && !((type == VALID
		    && curwin->w_lines[0].wl_valid
#ifdef FEAT_DIFF
		    && curwin->w_topfill == curwin->w_old_topfill
		    && curwin->w_botfill == curwin->w_old_botfill
#endif
		    && curwin->w_topline == curwin->w_lines[0].wl_lnum)
		|| (type == INVERTED
		    && VIsual_active
		    && curwin->w_old_cursor_lnum == curwin->w_cursor.lnum
		    && curwin->w_old_visual_mode == VIsual_mode
		    && (curwin->w_valid & VALID_VIRTCOL)
		    && curwin->w_old_curswant == curwin->w_curswant)
		))
	curwin->w_redr_type = type;

    // Redraw the tab pages line if needed.
    if (redraw_tabline || type >= NOT_VALID)
	draw_tabline();

#ifdef FEAT_SYN_HL
    // Correct stored syntax highlighting info for changes in each displayed
    // buffer.  Each buffer must only be done once.
    FOR_ALL_WINDOWS(wp)
    {
	if (wp->w_buffer->b_mod_set)
	{
	    win_T	*wwp;

	    // Check if we already did this buffer.
	    for (wwp = firstwin; wwp != wp; wwp = wwp->w_next)
		if (wwp->w_buffer == wp->w_buffer)
		    break;
	    if (wwp == wp && syntax_present(wp))
		syn_stack_apply_changes(wp->w_buffer);
	}
    }
#endif

    // Go from top to bottom through the windows, redrawing the ones that need
    // it.
#if defined(FEAT_SEARCH_EXTRA) || defined(FEAT_CLIPBOARD)
    did_update_one_window = FALSE;
#endif
#ifdef FEAT_SEARCH_EXTRA
    screen_search_hl.rm.regprog = NULL;
#endif
    FOR_ALL_WINDOWS(wp)
    {
	if (wp->w_redr_type != 0)
	{
	    cursor_off();
#ifdef FEAT_GUI
	    if (!did_one)
	    {
		did_one = TRUE;

		// Remove the cursor before starting to do anything, because
		// scrolling may make it difficult to redraw the text under
		// it.
		if (gui.in_use && wp == curwin)
		{
		    gui_cursor_col = gui.cursor_col;
		    gui_cursor_row = gui.cursor_row;
		    gui_undraw_cursor();
		    did_undraw = TRUE;
		}
	    }
#endif

	    win_update(wp);
	}

	// redraw status line after the window to minimize cursor movement
	if (wp->w_redr_status)
	{
	    cursor_off();
	    win_redr_status(wp, TRUE); // any popup menu will be redrawn below
	}
    }
#if defined(FEAT_SEARCH_EXTRA)
    end_search_hl();
#endif
    // May need to redraw the popup menu.
    pum_may_redraw();

    // Reset b_mod_set flags.  Going through all windows is probably faster
    // than going through all buffers (there could be many buffers).
    FOR_ALL_WINDOWS(wp)
	wp->w_buffer->b_mod_set = FALSE;

#ifdef FEAT_PROP_POPUP
    // Display popup windows on top of the windows and command line.
    update_popups(win_update);
#endif

    after_updating_screen(TRUE);

    // Clear or redraw the command line.  Done last, because scrolling may
    // mess up the command line.
    if (clear_cmdline || redraw_cmdline || redraw_mode)
	showmode();

    if (no_update)
	--no_win_do_lines_ins;

    // May put up an introductory message when not editing a file
    if (!did_intro)
	maybe_intro_message();
    did_intro = TRUE;

#ifdef FEAT_GUI
    // Redraw the cursor and update the scrollbars when all screen updating is
    // done.
    if (gui.in_use)
    {
	if (did_undraw && !gui_mch_is_blink_off())
	{
	    mch_disable_flush();
	    out_flush();	// required before updating the cursor
	    mch_enable_flush();

	    // Put the GUI position where the cursor was, gui_update_cursor()
	    // uses that.
	    gui.col = gui_cursor_col;
	    gui.row = gui_cursor_row;
	    gui.col = mb_fix_col(gui.col, gui.row);
	    gui_update_cursor(FALSE, FALSE);
	    gui_may_flush();
	    screen_cur_col = gui.col;
	    screen_cur_row = gui.row;
	}
	else
	    out_flush();
	gui_update_scrollbars(FALSE);
    }
#endif
    return OK;
}

/*
 * Redraw the status line of window wp.
 *
 * If inversion is possible we use it. Else '=' characters are used.
 * If "ignore_pum" is TRUE, also redraw statusline when the popup menu is
 * displayed.
 */
    void
win_redr_status(win_T *wp, int ignore_pum UNUSED)
{
    int		row;
    char_u	*p;
    int		len;
    int		fillchar;
    int		attr;
    int		this_ru_col;
    static int  busy = FALSE;

    // It's possible to get here recursively when 'statusline' (indirectly)
    // invokes ":redrawstatus".  Simply ignore the call then.
    if (busy)
	return;
    busy = TRUE;

    wp->w_redr_status = FALSE;
    if (wp->w_status_height == 0)
    {
	// no status line, can only be last window
	redraw_cmdline = TRUE;
    }
    else if (!redrawing()
	    // don't update status line when popup menu is visible and may be
	    // drawn over it, unless it will be redrawn later
	    || (!ignore_pum && pum_visible()))
    {
	// Don't redraw right now, do it later.
	wp->w_redr_status = TRUE;
    }
#ifdef FEAT_STL_OPT
    else if (*p_stl != NUL || *wp->w_p_stl != NUL)
    {
	// redraw custom status line
	redraw_custom_statusline(wp);
    }
#endif
    else
    {
	fillchar = fillchar_status(&attr, wp);

	get_trans_bufname(wp->w_buffer);
	p = NameBuff;
	len = (int)STRLEN(p);

	if (bt_help(wp->w_buffer)
#ifdef FEAT_QUICKFIX
		|| wp->w_p_pvw
#endif
		|| bufIsChanged(wp->w_buffer)
		|| wp->w_buffer->b_p_ro)
	    *(p + len++) = ' ';
	if (bt_help(wp->w_buffer))
	{
	    STRCPY(p + len, _("[Help]"));
	    len += (int)STRLEN(p + len);
	}
#ifdef FEAT_QUICKFIX
	if (wp->w_p_pvw)
	{
	    STRCPY(p + len, _("[Preview]"));
	    len += (int)STRLEN(p + len);
	}
#endif
	if (bufIsChanged(wp->w_buffer)
#ifdef FEAT_TERMINAL
		&& !bt_terminal(wp->w_buffer)
#endif
		)
	{
	    STRCPY(p + len, "[+]");
	    len += 3;
	}
	if (wp->w_buffer->b_p_ro)
	{
	    STRCPY(p + len, _("[RO]"));
	    len += (int)STRLEN(p + len);
	}

	this_ru_col = ru_col - (Columns - wp->w_width);
	if (this_ru_col < (wp->w_width + 1) / 2)
	    this_ru_col = (wp->w_width + 1) / 2;
	if (this_ru_col <= 1)
	{
	    p = (char_u *)"<";		// No room for file name!
	    len = 1;
	}
	else if (has_mbyte)
	{
	    int	clen = 0, i;

	    // Count total number of display cells.
	    clen = mb_string2cells(p, -1);

	    // Find first character that will fit.
	    // Going from start to end is much faster for DBCS.
	    for (i = 0; p[i] != NUL && clen >= this_ru_col - 1;
		    i += (*mb_ptr2len)(p + i))
		clen -= (*mb_ptr2cells)(p + i);
	    len = clen;
	    if (i > 0)
	    {
		p = p + i - 1;
		*p = '<';
		++len;
	    }

	}
	else if (len > this_ru_col - 1)
	{
	    p += len - (this_ru_col - 1);
	    *p = '<';
	    len = this_ru_col - 1;
	}

	row = W_WINROW(wp) + wp->w_height;
	screen_puts(p, row, wp->w_wincol, attr);
	screen_fill(row, row + 1, len + wp->w_wincol,
			this_ru_col + wp->w_wincol, fillchar, fillchar, attr);

	if (get_keymap_str(wp, (char_u *)"<%s>", NameBuff, MAXPATHL)
		&& (int)(this_ru_col - len) > (int)(STRLEN(NameBuff) + 1))
	    screen_puts(NameBuff, row, (int)(this_ru_col - STRLEN(NameBuff)
						   - 1 + wp->w_wincol), attr);

#ifdef FEAT_CMDL_INFO
	win_redr_ruler(wp, TRUE, ignore_pum);
#endif
    }

    /*
     * May need to draw the character below the vertical separator.
     */
    if (wp->w_vsep_width != 0 && wp->w_status_height != 0 && redrawing())
    {
	if (stl_connected(wp))
	    fillchar = fillchar_status(&attr, wp);
	else
	    fillchar = fillchar_vsep(&attr);
	screen_putchar(fillchar, W_WINROW(wp) + wp->w_height, W_ENDCOL(wp),
									attr);
    }
    busy = FALSE;
}

#ifdef FEAT_STL_OPT
/*
 * Redraw the status line according to 'statusline' and take care of any
 * errors encountered.
 */
    static void
redraw_custom_statusline(win_T *wp)
{
    static int	    entered = FALSE;
    int		    saved_did_emsg = did_emsg;

    // When called recursively return.  This can happen when the statusline
    // contains an expression that triggers a redraw.
    if (entered)
	return;
    entered = TRUE;

    did_emsg = FALSE;
    win_redr_custom(wp, FALSE);
    if (did_emsg)
    {
	// When there is an error disable the statusline, otherwise the
	// display is messed up with errors and a redraw triggers the problem
	// again and again.
	set_string_option_direct((char_u *)"statusline", -1,
		(char_u *)"", OPT_FREE | (*wp->w_p_stl != NUL
					? OPT_LOCAL : OPT_GLOBAL), SID_ERROR);
    }
    did_emsg |= saved_did_emsg;
    entered = FALSE;
}
#endif

/*
 * Show current status info in ruler and various other places
 * If always is FALSE, only show ruler if position has changed.
 */
    void
showruler(int always)
{
    if (!always && !redrawing())
	return;
    if (pum_visible())
    {
	// Don't redraw right now, do it later.
	curwin->w_redr_status = TRUE;
	return;
    }
#if defined(FEAT_STL_OPT)
    if ((*p_stl != NUL || *curwin->w_p_stl != NUL) && curwin->w_status_height)
	redraw_custom_statusline(curwin);
    else
#endif
#ifdef FEAT_CMDL_INFO
	win_redr_ruler(curwin, always, FALSE);
#endif

#ifdef FEAT_TITLE
    if (need_maketitle
# ifdef FEAT_STL_OPT
	    || (p_icon && (stl_syntax & STL_IN_ICON))
	    || (p_title && (stl_syntax & STL_IN_TITLE))
# endif
       )
	maketitle();
#endif
    // Redraw the tab pages line if needed.
    if (redraw_tabline)
	draw_tabline();
}

#if defined(FEAT_CMDL_INFO) || defined(PROTO)
    void
win_redr_ruler(win_T *wp, int always, int ignore_pum)
{
#define RULER_BUF_LEN 70
    char_u	buffer[RULER_BUF_LEN];
    int		row;
    int		fillchar;
    int		attr;
    int		empty_line = FALSE;
    colnr_T	virtcol;
    int		i;
    size_t	len;
    int		o;
    int		this_ru_col;
    int		off = 0;
    int		width;

    // If 'ruler' off or redrawing disabled, don't do anything
    if (!p_ru)
	return;

    /*
     * Check if cursor.lnum is valid, since win_redr_ruler() may be called
     * after deleting lines, before cursor.lnum is corrected.
     */
    if (wp->w_cursor.lnum > wp->w_buffer->b_ml.ml_line_count)
	return;

    // Don't draw the ruler while doing insert-completion, it might overwrite
    // the (long) mode message.
    if (wp == lastwin && lastwin->w_status_height == 0)
	if (edit_submode != NULL)
	    return;
    // Don't draw the ruler when the popup menu is visible, it may overlap.
    // Except when the popup menu will be redrawn anyway.
    if (!ignore_pum && pum_visible())
	return;

#ifdef FEAT_STL_OPT
    if (*p_ruf)
    {
	int	called_emsg_before = called_emsg;

	win_redr_custom(wp, TRUE);
	if (called_emsg > called_emsg_before)
	    set_string_option_direct((char_u *)"rulerformat", -1,
					   (char_u *)"", OPT_FREE, SID_ERROR);
	return;
    }
#endif

    /*
     * Check if not in Insert mode and the line is empty (will show "0-1").
     */
    if (!(State & INSERT)
		&& *ml_get_buf(wp->w_buffer, wp->w_cursor.lnum, FALSE) == NUL)
	empty_line = TRUE;

    /*
     * Only draw the ruler when something changed.
     */
    validate_virtcol_win(wp);
    if (       redraw_cmdline
	    || always
	    || wp->w_cursor.lnum != wp->w_ru_cursor.lnum
	    || wp->w_cursor.col != wp->w_ru_cursor.col
	    || wp->w_virtcol != wp->w_ru_virtcol
	    || wp->w_cursor.coladd != wp->w_ru_cursor.coladd
	    || wp->w_topline != wp->w_ru_topline
	    || wp->w_buffer->b_ml.ml_line_count != wp->w_ru_line_count
#ifdef FEAT_DIFF
	    || wp->w_topfill != wp->w_ru_topfill
#endif
	    || empty_line != wp->w_ru_empty)
    {
	cursor_off();
	if (wp->w_status_height)
	{
	    row = W_WINROW(wp) + wp->w_height;
	    fillchar = fillchar_status(&attr, wp);
	    off = wp->w_wincol;
	    width = wp->w_width;
	}
	else
	{
	    row = Rows - 1;
	    fillchar = ' ';
	    attr = 0;
	    width = Columns;
	    off = 0;
	}

	// In list mode virtcol needs to be recomputed
	virtcol = wp->w_virtcol;
	if (wp->w_p_list && lcs_tab1 == NUL)
	{
	    wp->w_p_list = FALSE;
	    getvvcol(wp, &wp->w_cursor, NULL, &virtcol, NULL);
	    wp->w_p_list = TRUE;
	}

	/*
	 * Some sprintfs return the length, some return a pointer.
	 * To avoid portability problems we use strlen() here.
	 */
	vim_snprintf((char *)buffer, RULER_BUF_LEN, "%ld,",
		(wp->w_buffer->b_ml.ml_flags & ML_EMPTY)
		    ? 0L
		    : (long)(wp->w_cursor.lnum));
	len = STRLEN(buffer);
	col_print(buffer + len, RULER_BUF_LEN - len,
			empty_line ? 0 : (int)wp->w_cursor.col + 1,
			(int)virtcol + 1);

	/*
	 * Add a "50%" if there is room for it.
	 * On the last line, don't print in the last column (scrolls the
	 * screen up on some terminals).
	 */
	i = (int)STRLEN(buffer);
	get_rel_pos(wp, buffer + i + 1, RULER_BUF_LEN - i - 1);
	o = i + vim_strsize(buffer + i + 1);
	if (wp->w_status_height == 0)	// can't use last char of screen
	    ++o;
	this_ru_col = ru_col - (Columns - width);
	if (this_ru_col < 0)
	    this_ru_col = 0;
	// Never use more than half the window/screen width, leave the other
	// half for the filename.
	if (this_ru_col < (width + 1) / 2)
	    this_ru_col = (width + 1) / 2;
	if (this_ru_col + o < width)
	{
	    // need at least 3 chars left for get_rel_pos() + NUL
	    while (this_ru_col + o < width && RULER_BUF_LEN > i + 4)
	    {
		if (has_mbyte)
		    i += (*mb_char2bytes)(fillchar, buffer + i);
		else
		    buffer[i++] = fillchar;
		++o;
	    }
	    get_rel_pos(wp, buffer + i, RULER_BUF_LEN - i);
	}
	// Truncate at window boundary.
	if (has_mbyte)
	{
	    o = 0;
	    for (i = 0; buffer[i] != NUL; i += (*mb_ptr2len)(buffer + i))
	    {
		o += (*mb_ptr2cells)(buffer + i);
		if (this_ru_col + o > width)
		{
		    buffer[i] = NUL;
		    break;
		}
	    }
	}
	else if (this_ru_col + (int)STRLEN(buffer) > width)
	    buffer[width - this_ru_col] = NUL;

	screen_puts(buffer, row, this_ru_col + off, attr);
	i = redraw_cmdline;
	screen_fill(row, row + 1,
		this_ru_col + off + (int)STRLEN(buffer),
		(int)(off + width),
		fillchar, fillchar, attr);
	// don't redraw the cmdline because of showing the ruler
	redraw_cmdline = i;
	wp->w_ru_cursor = wp->w_cursor;
	wp->w_ru_virtcol = wp->w_virtcol;
	wp->w_ru_empty = empty_line;
	wp->w_ru_topline = wp->w_topline;
	wp->w_ru_line_count = wp->w_buffer->b_ml.ml_line_count;
#ifdef FEAT_DIFF
	wp->w_ru_topfill = wp->w_topfill;
#endif
    }
}
#endif

/*
 * To be called when "updating_screen" was set before and now the postponed
 * side effects may take place.
 */
    void
after_updating_screen(int may_resize_shell UNUSED)
{
    updating_screen = FALSE;
#ifdef FEAT_GUI
    if (may_resize_shell)
	gui_may_resize_shell();
#endif
#ifdef FEAT_TERMINAL
    term_check_channel_closed_recently();
#endif

#ifdef HAVE_DROP_FILE
    // If handle_drop() was called while updating_screen was TRUE need to
    // handle the drop now.
    handle_any_postponed_drop();
#endif
}

/*
 * Update all windows that are editing the current buffer.
 */
    void
update_curbuf(int type)
{
    redraw_curbuf_later(type);
    update_screen(type);
}

#if defined(FEAT_MENU) || defined(FEAT_FOLDING)
/*
 * Copy "text" to ScreenLines using "attr".
 * Returns the next screen column.
 */
    static int
text_to_screenline(win_T *wp, char_u *text, int col)
{
    int		off = (int)(current_ScreenLine - ScreenLines);

    if (has_mbyte)
    {
	int	cells;
	int	u8c, u8cc[MAX_MCO];
	int	i;
	int	idx;
	int	c_len;
	char_u	*p;
# ifdef FEAT_ARABIC
	int	prev_c = 0;		// previous Arabic character
	int	prev_c1 = 0;		// first composing char for prev_c
# endif

# ifdef FEAT_RIGHTLEFT
	if (wp->w_p_rl)
	    idx = off;
	else
# endif
	    idx = off + col;

	// Store multibyte characters in ScreenLines[] et al. correctly.
	for (p = text; *p != NUL; )
	{
	    cells = (*mb_ptr2cells)(p);
	    c_len = (*mb_ptr2len)(p);
	    if (col + cells > wp->w_width
# ifdef FEAT_RIGHTLEFT
		    - (wp->w_p_rl ? col : 0)
# endif
		    )
		break;
	    ScreenLines[idx] = *p;
	    if (enc_utf8)
	    {
		u8c = utfc_ptr2char(p, u8cc);
		if (*p < 0x80 && u8cc[0] == 0)
		{
		    ScreenLinesUC[idx] = 0;
#ifdef FEAT_ARABIC
		    prev_c = u8c;
#endif
		}
		else
		{
#ifdef FEAT_ARABIC
		    if (p_arshape && !p_tbidi && ARABIC_CHAR(u8c))
		    {
			// Do Arabic shaping.
			int	pc, pc1, nc;
			int	pcc[MAX_MCO];
			int	firstbyte = *p;

			// The idea of what is the previous and next
			// character depends on 'rightleft'.
			if (wp->w_p_rl)
			{
			    pc = prev_c;
			    pc1 = prev_c1;
			    nc = utf_ptr2char(p + c_len);
			    prev_c1 = u8cc[0];
			}
			else
			{
			    pc = utfc_ptr2char(p + c_len, pcc);
			    nc = prev_c;
			    pc1 = pcc[0];
			}
			prev_c = u8c;

			u8c = arabic_shape(u8c, &firstbyte, &u8cc[0],
								 pc, pc1, nc);
			ScreenLines[idx] = firstbyte;
		    }
		    else
			prev_c = u8c;
#endif
		    // Non-BMP character: display as ? or fullwidth ?.
		    ScreenLinesUC[idx] = u8c;
		    for (i = 0; i < Screen_mco; ++i)
		    {
			ScreenLinesC[i][idx] = u8cc[i];
			if (u8cc[i] == 0)
			    break;
		    }
		}
		if (cells > 1)
		    ScreenLines[idx + 1] = 0;
	    }
	    else if (enc_dbcs == DBCS_JPNU && *p == 0x8e)
		// double-byte single width character
		ScreenLines2[idx] = p[1];
	    else if (cells > 1)
		// double-width character
		ScreenLines[idx + 1] = p[1];
	    col += cells;
	    idx += cells;
	    p += c_len;
	}
    }
    else
    {
	int len = (int)STRLEN(text);

	if (len > wp->w_width - col)
	    len = wp->w_width - col;
	if (len > 0)
	{
#ifdef FEAT_RIGHTLEFT
	    if (wp->w_p_rl)
		mch_memmove(current_ScreenLine, text, len);
	    else
#endif
		mch_memmove(current_ScreenLine + col, text, len);
	    col += len;
	}
    }
    return col;
}
#endif

#ifdef FEAT_MENU
/*
 * Draw the window toolbar.
 */
    static void
redraw_win_toolbar(win_T *wp)
{
    vimmenu_T	*menu;
    int		item_idx = 0;
    int		item_count = 0;
    int		col = 0;
    int		next_col;
    int		off = (int)(current_ScreenLine - ScreenLines);
    int		fill_attr = syn_name2attr((char_u *)"ToolbarLine");
    int		button_attr = syn_name2attr((char_u *)"ToolbarButton");

    vim_free(wp->w_winbar_items);
    for (menu = wp->w_winbar->children; menu != NULL; menu = menu->next)
	++item_count;
    wp->w_winbar_items = ALLOC_CLEAR_MULT(winbar_item_T, item_count + 1);

    // TODO: use fewer spaces if there is not enough room
    for (menu = wp->w_winbar->children;
			  menu != NULL && col < wp->w_width; menu = menu->next)
    {
	space_to_screenline(off + col, fill_attr);
	if (++col >= wp->w_width)
	    break;
	if (col > 1)
	{
	    space_to_screenline(off + col, fill_attr);
	    if (++col >= wp->w_width)
		break;
	}

	wp->w_winbar_items[item_idx].wb_startcol = col;
	space_to_screenline(off + col, button_attr);
	if (++col >= wp->w_width)
	    break;

	next_col = text_to_screenline(wp, menu->name, col);
	while (col < next_col)
	{
	    ScreenAttrs[off + col] = button_attr;
	    ++col;
	}
	wp->w_winbar_items[item_idx].wb_endcol = col;
	wp->w_winbar_items[item_idx].wb_menu = menu;
	++item_idx;

	if (col >= wp->w_width)
	    break;
	space_to_screenline(off + col, button_attr);
	++col;
    }
    while (col < wp->w_width)
    {
	space_to_screenline(off + col, fill_attr);
	++col;
    }
    wp->w_winbar_items[item_idx].wb_menu = NULL; // end marker

    screen_line(wp->w_winrow, wp->w_wincol, (int)wp->w_width,
							  (int)wp->w_width, 0);
}
#endif

#if defined(FEAT_FOLDING) || defined(PROTO)
/*
 * Copy "buf[len]" to ScreenLines["off"] and set attributes to "attr".
 */
    static void
copy_text_attr(
    int		off,
    char_u	*buf,
    int		len,
    int		attr)
{
    int		i;

    mch_memmove(ScreenLines + off, buf, (size_t)len);
    if (enc_utf8)
	vim_memset(ScreenLinesUC + off, 0, sizeof(u8char_T) * (size_t)len);
    for (i = 0; i < len; ++i)
	ScreenAttrs[off + i] = attr;
}

/*
 * Display one folded line.
 */
    static void
fold_line(
    win_T	*wp,
    long	fold_count,
    foldinfo_T	*foldinfo,
    linenr_T	lnum,
    int		row)
{
    char_u	buf[FOLD_TEXT_LEN];
    pos_T	*top, *bot;
    linenr_T	lnume = lnum + fold_count - 1;
    int		len;
    char_u	*text;
    int		fdc;
    int		col;
    int		txtcol;
    int		off = (int)(current_ScreenLine - ScreenLines);
    int		ri;

    // Build the fold line:
    // 1. Add the cmdwin_type for the command-line window
    // 2. Add the 'foldcolumn'
    // 3. Add the 'number' or 'relativenumber' column
    // 4. Compose the text
    // 5. Add the text
    // 6. set highlighting for the Visual area an other text
    col = 0;

    // 1. Add the cmdwin_type for the command-line window
    // Ignores 'rightleft', this window is never right-left.
#ifdef FEAT_CMDWIN
    if (cmdwin_type != 0 && wp == curwin)
    {
	ScreenLines[off] = cmdwin_type;
	ScreenAttrs[off] = HL_ATTR(HLF_AT);
	if (enc_utf8)
	    ScreenLinesUC[off] = 0;
	++col;
    }
#endif

    // 2. Add the 'foldcolumn'
    //    Reduce the width when there is not enough space.
    fdc = compute_foldcolumn(wp, col);
    if (fdc > 0)
    {
	fill_foldcolumn(buf, wp, TRUE, lnum);
#ifdef FEAT_RIGHTLEFT
	if (wp->w_p_rl)
	{
	    int		i;

	    copy_text_attr(off + wp->w_width - fdc - col, buf, fdc,
							     HL_ATTR(HLF_FC));
	    // reverse the fold column
	    for (i = 0; i < fdc; ++i)
		ScreenLines[off + wp->w_width - i - 1 - col] = buf[i];
	}
	else
#endif
	    copy_text_attr(off + col, buf, fdc, HL_ATTR(HLF_FC));
	col += fdc;
    }

#ifdef FEAT_RIGHTLEFT
# define RL_MEMSET(p, v, l) \
    do { \
	if (wp->w_p_rl) \
	    for (ri = 0; ri < l; ++ri) \
	       ScreenAttrs[off + (wp->w_width - (p) - (l)) + ri] = v; \
	 else \
	    for (ri = 0; ri < l; ++ri) \
	       ScreenAttrs[off + (p) + ri] = v; \
    } while (0)
#else
# define RL_MEMSET(p, v, l) \
    do { \
	for (ri = 0; ri < l; ++ri) \
	    ScreenAttrs[off + (p) + ri] = v; \
    } while (0)
#endif

    // Set all attributes of the 'number' or 'relativenumber' column and the
    // text
    RL_MEMSET(col, HL_ATTR(HLF_FL), wp->w_width - col);

#ifdef FEAT_SIGNS
    // If signs are being displayed, add two spaces.
    if (signcolumn_on(wp))
    {
	len = wp->w_width - col;
	if (len > 0)
	{
	    if (len > 2)
		len = 2;
# ifdef FEAT_RIGHTLEFT
	    if (wp->w_p_rl)
		// the line number isn't reversed
		copy_text_attr(off + wp->w_width - len - col,
					(char_u *)"  ", len, HL_ATTR(HLF_FL));
	    else
# endif
		copy_text_attr(off + col, (char_u *)"  ", len, HL_ATTR(HLF_FL));
	    col += len;
	}
    }
#endif

    // 3. Add the 'number' or 'relativenumber' column
    if (wp->w_p_nu || wp->w_p_rnu)
    {
	len = wp->w_width - col;
	if (len > 0)
	{
	    int	    w = number_width(wp);
	    long    num;
	    char    *fmt = "%*ld ";

	    if (len > w + 1)
		len = w + 1;

	    if (wp->w_p_nu && !wp->w_p_rnu)
		// 'number' + 'norelativenumber'
		num = (long)lnum;
	    else
	    {
		// 'relativenumber', don't use negative numbers
		num = labs((long)get_cursor_rel_lnum(wp, lnum));
		if (num == 0 && wp->w_p_nu && wp->w_p_rnu)
		{
		    // 'number' + 'relativenumber': cursor line shows absolute
		    // line number
		    num = lnum;
		    fmt = "%-*ld ";
		}
	    }

	    sprintf((char *)buf, fmt, w, num);
#ifdef FEAT_RIGHTLEFT
	    if (wp->w_p_rl)
		// the line number isn't reversed
		copy_text_attr(off + wp->w_width - len - col, buf, len,
							     HL_ATTR(HLF_FL));
	    else
#endif
		copy_text_attr(off + col, buf, len, HL_ATTR(HLF_FL));
	    col += len;
	}
    }

    // 4. Compose the folded-line string with 'foldtext', if set.
    text = get_foldtext(wp, lnum, lnume, foldinfo, buf);

    txtcol = col;	// remember where text starts

    // 5. move the text to current_ScreenLine.  Fill up with "fill_fold".
    //    Right-left text is put in columns 0 - number-col, normal text is put
    //    in columns number-col - window-width.
    col = text_to_screenline(wp, text, col);

    // Fill the rest of the line with the fold filler
#ifdef FEAT_RIGHTLEFT
    if (wp->w_p_rl)
	col -= txtcol;
#endif
    while (col < wp->w_width
#ifdef FEAT_RIGHTLEFT
		    - (wp->w_p_rl ? txtcol : 0)
#endif
	    )
    {
	if (enc_utf8)
	{
	    if (fill_fold >= 0x80)
	    {
		ScreenLinesUC[off + col] = fill_fold;
		ScreenLinesC[0][off + col] = 0;
		ScreenLines[off + col] = 0x80; // avoid storing zero
	    }
	    else
	    {
		ScreenLinesUC[off + col] = 0;
		ScreenLines[off + col] = fill_fold;
	    }
	    col++;
	}
	else
	    ScreenLines[off + col++] = fill_fold;
    }

    if (text != buf)
	vim_free(text);

    // 6. set highlighting for the Visual area an other text.
    // If all folded lines are in the Visual area, highlight the line.
    if (VIsual_active && wp->w_buffer == curwin->w_buffer)
    {
	if (LTOREQ_POS(curwin->w_cursor, VIsual))
	{
	    // Visual is after curwin->w_cursor
	    top = &curwin->w_cursor;
	    bot = &VIsual;
	}
	else
	{
	    // Visual is before curwin->w_cursor
	    top = &VIsual;
	    bot = &curwin->w_cursor;
	}
	if (lnum >= top->lnum
		&& lnume <= bot->lnum
		&& (VIsual_mode != 'v'
		    || ((lnum > top->lnum
			    || (lnum == top->lnum
				&& top->col == 0))
			&& (lnume < bot->lnum
			    || (lnume == bot->lnum
				&& (bot->col - (*p_sel == 'e'))
		>= (colnr_T)STRLEN(ml_get_buf(wp->w_buffer, lnume, FALSE)))))))
	{
	    if (VIsual_mode == Ctrl_V)
	    {
		// Visual block mode: highlight the chars part of the block
		if (wp->w_old_cursor_fcol + txtcol < (colnr_T)wp->w_width)
		{
		    if (wp->w_old_cursor_lcol != MAXCOL
			     && wp->w_old_cursor_lcol + txtcol
						       < (colnr_T)wp->w_width)
			len = wp->w_old_cursor_lcol;
		    else
			len = wp->w_width - txtcol;
		    RL_MEMSET(wp->w_old_cursor_fcol + txtcol, HL_ATTR(HLF_V),
					    len - (int)wp->w_old_cursor_fcol);
		}
	    }
	    else
	    {
		// Set all attributes of the text
		RL_MEMSET(txtcol, HL_ATTR(HLF_V), wp->w_width - txtcol);
	    }
	}
    }

#ifdef FEAT_SYN_HL
    // Show colorcolumn in the fold line, but let cursorcolumn override it.
    if (wp->w_p_cc_cols)
    {
	int i = 0;
	int j = wp->w_p_cc_cols[i];
	int old_txtcol = txtcol;

	while (j > -1)
	{
	    txtcol += j;
	    if (wp->w_p_wrap)
		txtcol -= wp->w_skipcol;
	    else
		txtcol -= wp->w_leftcol;
	    if (txtcol >= 0 && txtcol < wp->w_width)
		ScreenAttrs[off + txtcol] = hl_combine_attr(
				    ScreenAttrs[off + txtcol], HL_ATTR(HLF_MC));
	    txtcol = old_txtcol;
	    j = wp->w_p_cc_cols[++i];
	}
    }

    // Show 'cursorcolumn' in the fold line.
    if (wp->w_p_cuc)
    {
	txtcol += wp->w_virtcol;
	if (wp->w_p_wrap)
	    txtcol -= wp->w_skipcol;
	else
	    txtcol -= wp->w_leftcol;
	if (txtcol >= 0 && txtcol < wp->w_width)
	    ScreenAttrs[off + txtcol] = hl_combine_attr(
				 ScreenAttrs[off + txtcol], HL_ATTR(HLF_CUC));
    }
#endif

    screen_line(row + W_WINROW(wp), wp->w_wincol, (int)wp->w_width,
						     (int)wp->w_width, 0);

    // Update w_cline_height and w_cline_folded if the cursor line was
    // updated (saves a call to plines() later).
    if (wp == curwin
	    && lnum <= curwin->w_cursor.lnum
	    && lnume >= curwin->w_cursor.lnum)
    {
	curwin->w_cline_row = row;
	curwin->w_cline_height = 1;
	curwin->w_cline_folded = TRUE;
	curwin->w_valid |= (VALID_CHEIGHT|VALID_CROW);
    }
}
#endif

/*
 * Update a single window.
 *
 * This may cause the windows below it also to be redrawn (when clearing the
 * screen or scrolling lines).
 *
 * How the window is redrawn depends on wp->w_redr_type.  Each type also
 * implies the one below it.
 * NOT_VALID	redraw the whole window
 * SOME_VALID	redraw the whole window but do scroll when possible
 * REDRAW_TOP	redraw the top w_upd_rows window lines, otherwise like VALID
 * INVERTED	redraw the changed part of the Visual area
 * INVERTED_ALL	redraw the whole Visual area
 * VALID	1. scroll up/down to adjust for a changed w_topline
 *		2. update lines at the top when scrolled down
 *		3. redraw changed text:
 *		   - if wp->w_buffer->b_mod_set set, update lines between
 *		     b_mod_top and b_mod_bot.
 *		   - if wp->w_redraw_top non-zero, redraw lines between
 *		     wp->w_redraw_top and wp->w_redr_bot.
 *		   - continue redrawing when syntax status is invalid.
 *		4. if scrolled up, update lines at the bottom.
 * This results in three areas that may need updating:
 * top:	from first row to top_end (when scrolled down)
 * mid: from mid_start to mid_end (update inversion or changed text)
 * bot: from bot_start to last row (when scrolled up)
 */
    static void
win_update(win_T *wp)
{
    buf_T	*buf = wp->w_buffer;
    int		type;
    int		top_end = 0;	// Below last row of the top area that needs
				// updating.  0 when no top area updating.
    int		mid_start = 999;// first row of the mid area that needs
				// updating.  999 when no mid area updating.
    int		mid_end = 0;	// Below last row of the mid area that needs
				// updating.  0 when no mid area updating.
    int		bot_start = 999;// first row of the bot area that needs
				// updating.  999 when no bot area updating
    int		scrolled_down = FALSE;	// TRUE when scrolled down when
					// w_topline got smaller a bit
#ifdef FEAT_SEARCH_EXTRA
    int		top_to_mod = FALSE;    // redraw above mod_top
#endif

    int		row;		// current window row to display
    linenr_T	lnum;		// current buffer lnum to display
    int		idx;		// current index in w_lines[]
    int		srow;		// starting row of the current line

    int		eof = FALSE;	// if TRUE, we hit the end of the file
    int		didline = FALSE; // if TRUE, we finished the last line
    int		i;
    long	j;
    static int	recursive = FALSE;	// being called recursively
    linenr_T	old_botline = wp->w_botline;
#ifdef FEAT_CONCEAL
    int		old_wrow = wp->w_wrow;
    int		old_wcol = wp->w_wcol;
#endif
#ifdef FEAT_FOLDING
    long	fold_count;
#endif
#ifdef FEAT_SYN_HL
    // remember what happened to the previous line, to know if
    // check_visual_highlight() can be used
#define DID_NONE 1	// didn't update a line
#define DID_LINE 2	// updated a normal line
#define DID_FOLD 3	// updated a folded line
    int		did_update = DID_NONE;
    linenr_T	syntax_last_parsed = 0;		// last parsed text line
#endif
    linenr_T	mod_top = 0;
    linenr_T	mod_bot = 0;
#if defined(FEAT_SYN_HL) || defined(FEAT_SEARCH_EXTRA)
    int		save_got_int;
#endif
#ifdef SYN_TIME_LIMIT
    proftime_T	syntax_tm;
#endif

#if defined(FEAT_SEARCH_EXTRA) || defined(FEAT_CLIPBOARD)
    // This needs to be done only for the first window when update_screen() is
    // called.
    if (!did_update_one_window)
    {
	did_update_one_window = TRUE;
# ifdef FEAT_SEARCH_EXTRA
	start_search_hl();
# endif
# ifdef FEAT_CLIPBOARD
	// When Visual area changed, may have to update selection.
	if (clip_star.available && clip_isautosel_star())
	    clip_update_selection(&clip_star);
	if (clip_plus.available && clip_isautosel_plus())
	    clip_update_selection(&clip_plus);
# endif
    }
#endif

    type = wp->w_redr_type;

    if (type == NOT_VALID)
    {
	wp->w_redr_status = TRUE;
	wp->w_lines_valid = 0;
    }

    // Window is zero-height: nothing to draw.
    if (wp->w_height + WINBAR_HEIGHT(wp) == 0)
    {
	wp->w_redr_type = 0;
	return;
    }

    // Window is zero-width: Only need to draw the separator.
    if (wp->w_width == 0)
    {
	// draw the vertical separator right of this window
	draw_vsep_win(wp, 0);
	wp->w_redr_type = 0;
	return;
    }

#ifdef FEAT_TERMINAL
    // If this window contains a terminal, redraw works completely differently.
    if (term_do_update_window(wp))
    {
	term_update_window(wp);
# ifdef FEAT_MENU
	// Draw the window toolbar, if there is one.
	if (winbar_height(wp) > 0)
	    redraw_win_toolbar(wp);
# endif
	wp->w_redr_type = 0;
	return;
    }
#endif

#ifdef FEAT_SEARCH_EXTRA
    init_search_hl(wp, &screen_search_hl);
#endif

#ifdef FEAT_LINEBREAK
    // Force redraw when width of 'number' or 'relativenumber' column
    // changes.
    i = (wp->w_p_nu || wp->w_p_rnu) ? number_width(wp) : 0;
    if (wp->w_nrwidth != i)
    {
	type = NOT_VALID;
	wp->w_nrwidth = i;
    }
    else
#endif

    if (buf->b_mod_set && buf->b_mod_xlines != 0 && wp->w_redraw_top != 0)
    {
	// When there are both inserted/deleted lines and specific lines to be
	// redrawn, w_redraw_top and w_redraw_bot may be invalid, just redraw
	// everything (only happens when redrawing is off for while).
	type = NOT_VALID;
    }
    else
    {
	// Set mod_top to the first line that needs displaying because of
	// changes.  Set mod_bot to the first line after the changes.
	mod_top = wp->w_redraw_top;
	if (wp->w_redraw_bot != 0)
	    mod_bot = wp->w_redraw_bot + 1;
	else
	    mod_bot = 0;
	if (buf->b_mod_set)
	{
	    if (mod_top == 0 || mod_top > buf->b_mod_top)
	    {
		mod_top = buf->b_mod_top;
#ifdef FEAT_SYN_HL
		// Need to redraw lines above the change that may be included
		// in a pattern match.
		if (syntax_present(wp))
		{
		    mod_top -= buf->b_s.b_syn_sync_linebreaks;
		    if (mod_top < 1)
			mod_top = 1;
		}
#endif
	    }
	    if (mod_bot == 0 || mod_bot < buf->b_mod_bot)
		mod_bot = buf->b_mod_bot;

#ifdef FEAT_SEARCH_EXTRA
	    // When 'hlsearch' is on and using a multi-line search pattern, a
	    // change in one line may make the Search highlighting in a
	    // previous line invalid.  Simple solution: redraw all visible
	    // lines above the change.
	    // Same for a match pattern.
	    if (screen_search_hl.rm.regprog != NULL
		    && re_multiline(screen_search_hl.rm.regprog))
		top_to_mod = TRUE;
	    else
	    {
		matchitem_T *cur = wp->w_match_head;

		while (cur != NULL)
		{
		    if (cur->match.regprog != NULL
					   && re_multiline(cur->match.regprog))
		    {
			top_to_mod = TRUE;
			break;
		    }
		    cur = cur->next;
		}
	    }
#endif
	}
#ifdef FEAT_FOLDING
	if (mod_top != 0 && hasAnyFolding(wp))
	{
	    linenr_T	lnumt, lnumb;

	    // A change in a line can cause lines above it to become folded or
	    // unfolded.  Find the top most buffer line that may be affected.
	    // If the line was previously folded and displayed, get the first
	    // line of that fold.  If the line is folded now, get the first
	    // folded line.  Use the minimum of these two.

	    // Find last valid w_lines[] entry above mod_top.  Set lnumt to
	    // the line below it.  If there is no valid entry, use w_topline.
	    // Find the first valid w_lines[] entry below mod_bot.  Set lnumb
	    // to this line.  If there is no valid entry, use MAXLNUM.
	    lnumt = wp->w_topline;
	    lnumb = MAXLNUM;
	    for (i = 0; i < wp->w_lines_valid; ++i)
		if (wp->w_lines[i].wl_valid)
		{
		    if (wp->w_lines[i].wl_lastlnum < mod_top)
			lnumt = wp->w_lines[i].wl_lastlnum + 1;
		    if (lnumb == MAXLNUM && wp->w_lines[i].wl_lnum >= mod_bot)
		    {
			lnumb = wp->w_lines[i].wl_lnum;
			// When there is a fold column it might need updating
			// in the next line ("J" just above an open fold).
			if (compute_foldcolumn(wp, 0) > 0)
			    ++lnumb;
		    }
		}

	    (void)hasFoldingWin(wp, mod_top, &mod_top, NULL, TRUE, NULL);
	    if (mod_top > lnumt)
		mod_top = lnumt;

	    // Now do the same for the bottom line (one above mod_bot).
	    --mod_bot;
	    (void)hasFoldingWin(wp, mod_bot, NULL, &mod_bot, TRUE, NULL);
	    ++mod_bot;
	    if (mod_bot < lnumb)
		mod_bot = lnumb;
	}
#endif

	// When a change starts above w_topline and the end is below
	// w_topline, start redrawing at w_topline.
	// If the end of the change is above w_topline: do like no change was
	// made, but redraw the first line to find changes in syntax.
	if (mod_top != 0 && mod_top < wp->w_topline)
	{
	    if (mod_bot > wp->w_topline)
		mod_top = wp->w_topline;
#ifdef FEAT_SYN_HL
	    else if (syntax_present(wp))
		top_end = 1;
#endif
	}

	// When line numbers are displayed need to redraw all lines below
	// inserted/deleted lines.
	if (mod_top != 0 && buf->b_mod_xlines != 0 && wp->w_p_nu)
	    mod_bot = MAXLNUM;
    }
    wp->w_redraw_top = 0;	// reset for next time
    wp->w_redraw_bot = 0;

    // When only displaying the lines at the top, set top_end.  Used when
    // window has scrolled down for msg_scrolled.
    if (type == REDRAW_TOP)
    {
	j = 0;
	for (i = 0; i < wp->w_lines_valid; ++i)
	{
	    j += wp->w_lines[i].wl_size;
	    if (j >= wp->w_upd_rows)
	    {
		top_end = j;
		break;
	    }
	}
	if (top_end == 0)
	    // not found (cannot happen?): redraw everything
	    type = NOT_VALID;
	else
	    // top area defined, the rest is VALID
	    type = VALID;
    }

    // Trick: we want to avoid clearing the screen twice.  screenclear() will
    // set "screen_cleared" to TRUE.  The special value MAYBE (which is still
    // non-zero and thus not FALSE) will indicate that screenclear() was not
    // called.
    if (screen_cleared)
	screen_cleared = MAYBE;

    // If there are no changes on the screen that require a complete redraw,
    // handle three cases:
    // 1: we are off the top of the screen by a few lines: scroll down
    // 2: wp->w_topline is below wp->w_lines[0].wl_lnum: may scroll up
    // 3: wp->w_topline is wp->w_lines[0].wl_lnum: find first entry in
    //    w_lines[] that needs updating.
    if ((type == VALID || type == SOME_VALID
				  || type == INVERTED || type == INVERTED_ALL)
#ifdef FEAT_DIFF
	    && !wp->w_botfill && !wp->w_old_botfill
#endif
	    )
    {
	if (mod_top != 0 && wp->w_topline == mod_top)
	{
	    // w_topline is the first changed line, the scrolling will be done
	    // further down.
	}
	else if (wp->w_lines[0].wl_valid
		&& (wp->w_topline < wp->w_lines[0].wl_lnum
#ifdef FEAT_DIFF
		    || (wp->w_topline == wp->w_lines[0].wl_lnum
			&& wp->w_topfill > wp->w_old_topfill)
#endif
		   ))
	{
	    // New topline is above old topline: May scroll down.
#ifdef FEAT_FOLDING
	    if (hasAnyFolding(wp))
	    {
		linenr_T ln;

		// count the number of lines we are off, counting a sequence
		// of folded lines as one
		j = 0;
		for (ln = wp->w_topline; ln < wp->w_lines[0].wl_lnum; ++ln)
		{
		    ++j;
		    if (j >= wp->w_height - 2)
			break;
		    (void)hasFoldingWin(wp, ln, NULL, &ln, TRUE, NULL);
		}
	    }
	    else
#endif
		j = wp->w_lines[0].wl_lnum - wp->w_topline;
	    if (j < wp->w_height - 2)		// not too far off
	    {
		i = plines_m_win(wp, wp->w_topline, wp->w_lines[0].wl_lnum - 1);
#ifdef FEAT_DIFF
		// insert extra lines for previously invisible filler lines
		if (wp->w_lines[0].wl_lnum != wp->w_topline)
		    i += diff_check_fill(wp, wp->w_lines[0].wl_lnum)
							  - wp->w_old_topfill;
#endif
		if (i < wp->w_height - 2)	// less than a screen off
		{
		    // Try to insert the correct number of lines.
		    // If not the last window, delete the lines at the bottom.
		    // win_ins_lines may fail when the terminal can't do it.
		    if (i > 0)
			check_for_delay(FALSE);
		    if (win_ins_lines(wp, 0, i, FALSE, wp == firstwin) == OK)
		    {
			if (wp->w_lines_valid != 0)
			{
			    // Need to update rows that are new, stop at the
			    // first one that scrolled down.
			    top_end = i;
			    scrolled_down = TRUE;

			    // Move the entries that were scrolled, disable
			    // the entries for the lines to be redrawn.
			    if ((wp->w_lines_valid += j) > wp->w_height)
				wp->w_lines_valid = wp->w_height;
			    for (idx = wp->w_lines_valid; idx - j >= 0; idx--)
				wp->w_lines[idx] = wp->w_lines[idx - j];
			    while (idx >= 0)
				wp->w_lines[idx--].wl_valid = FALSE;
			}
		    }
		    else
			mid_start = 0;		// redraw all lines
		}
		else
		    mid_start = 0;		// redraw all lines
	    }
	    else
		mid_start = 0;		// redraw all lines
	}
	else
	{
	    // New topline is at or below old topline: May scroll up.
	    // When topline didn't change, find first entry in w_lines[] that
	    // needs updating.

	    // try to find wp->w_topline in wp->w_lines[].wl_lnum
	    j = -1;
	    row = 0;
	    for (i = 0; i < wp->w_lines_valid; i++)
	    {
		if (wp->w_lines[i].wl_valid
			&& wp->w_lines[i].wl_lnum == wp->w_topline)
		{
		    j = i;
		    break;
		}
		row += wp->w_lines[i].wl_size;
	    }
	    if (j == -1)
	    {
		// if wp->w_topline is not in wp->w_lines[].wl_lnum redraw all
		// lines
		mid_start = 0;
	    }
	    else
	    {
		// Try to delete the correct number of lines.
		// wp->w_topline is at wp->w_lines[i].wl_lnum.
#ifdef FEAT_DIFF
		// If the topline didn't change, delete old filler lines,
		// otherwise delete filler lines of the new topline...
		if (wp->w_lines[0].wl_lnum == wp->w_topline)
		    row += wp->w_old_topfill;
		else
		    row += diff_check_fill(wp, wp->w_topline);
		// ... but don't delete new filler lines.
		row -= wp->w_topfill;
#endif
		if (row > 0)
		{
		    check_for_delay(FALSE);
		    if (win_del_lines(wp, 0, row, FALSE, wp == firstwin, 0)
									 == OK)
			bot_start = wp->w_height - row;
		    else
			mid_start = 0;		// redraw all lines
		}
		if ((row == 0 || bot_start < 999) && wp->w_lines_valid != 0)
		{
		    // Skip the lines (below the deleted lines) that are still
		    // valid and don't need redrawing.	Copy their info
		    // upwards, to compensate for the deleted lines.  Set
		    // bot_start to the first row that needs redrawing.
		    bot_start = 0;
		    idx = 0;
		    for (;;)
		    {
			wp->w_lines[idx] = wp->w_lines[j];
			// stop at line that didn't fit, unless it is still
			// valid (no lines deleted)
			if (row > 0 && bot_start + row
				 + (int)wp->w_lines[j].wl_size > wp->w_height)
			{
			    wp->w_lines_valid = idx + 1;
			    break;
			}
			bot_start += wp->w_lines[idx++].wl_size;

			// stop at the last valid entry in w_lines[].wl_size
			if (++j >= wp->w_lines_valid)
			{
			    wp->w_lines_valid = idx;
			    break;
			}
		    }
#ifdef FEAT_DIFF
		    // Correct the first entry for filler lines at the top
		    // when it won't get updated below.
		    if (wp->w_p_diff && bot_start > 0)
			wp->w_lines[0].wl_size =
			    plines_win_nofill(wp, wp->w_topline, TRUE)
							      + wp->w_topfill;
#endif
		}
	    }
	}

	// When starting redraw in the first line, redraw all lines.  When
	// there is only one window it's probably faster to clear the screen
	// first.
	if (mid_start == 0)
	{
	    mid_end = wp->w_height;
	    if (ONE_WINDOW && !WIN_IS_POPUP(wp))
	    {
		// Clear the screen when it was not done by win_del_lines() or
		// win_ins_lines() above, "screen_cleared" is FALSE or MAYBE
		// then.
		if (screen_cleared != TRUE)
		    screenclear();
		// The screen was cleared, redraw the tab pages line.
		if (redraw_tabline)
		    draw_tabline();
	    }
	}

	// When win_del_lines() or win_ins_lines() caused the screen to be
	// cleared (only happens for the first window) or when screenclear()
	// was called directly above, "must_redraw" will have been set to
	// NOT_VALID, need to reset it here to avoid redrawing twice.
	if (screen_cleared == TRUE)
	    must_redraw = 0;
    }
    else
    {
	// Not VALID or INVERTED: redraw all lines.
	mid_start = 0;
	mid_end = wp->w_height;
    }

    if (type == SOME_VALID)
    {
	// SOME_VALID: redraw all lines.
	mid_start = 0;
	mid_end = wp->w_height;
	type = NOT_VALID;
    }

    // check if we are updating or removing the inverted part
    if ((VIsual_active && buf == curwin->w_buffer)
	    || (wp->w_old_cursor_lnum != 0 && type != NOT_VALID))
    {
	linenr_T    from, to;

	if (VIsual_active)
	{
	    if (VIsual_active
		    && (VIsual_mode != wp->w_old_visual_mode
			|| type == INVERTED_ALL))
	    {
		// If the type of Visual selection changed, redraw the whole
		// selection.  Also when the ownership of the X selection is
		// gained or lost.
		if (curwin->w_cursor.lnum < VIsual.lnum)
		{
		    from = curwin->w_cursor.lnum;
		    to = VIsual.lnum;
		}
		else
		{
		    from = VIsual.lnum;
		    to = curwin->w_cursor.lnum;
		}
		// redraw more when the cursor moved as well
		if (wp->w_old_cursor_lnum < from)
		    from = wp->w_old_cursor_lnum;
		if (wp->w_old_cursor_lnum > to)
		    to = wp->w_old_cursor_lnum;
		if (wp->w_old_visual_lnum < from)
		    from = wp->w_old_visual_lnum;
		if (wp->w_old_visual_lnum > to)
		    to = wp->w_old_visual_lnum;
	    }
	    else
	    {
		// Find the line numbers that need to be updated: The lines
		// between the old cursor position and the current cursor
		// position.  Also check if the Visual position changed.
		if (curwin->w_cursor.lnum < wp->w_old_cursor_lnum)
		{
		    from = curwin->w_cursor.lnum;
		    to = wp->w_old_cursor_lnum;
		}
		else
		{
		    from = wp->w_old_cursor_lnum;
		    to = curwin->w_cursor.lnum;
		    if (from == 0)	// Visual mode just started
			from = to;
		}

		if (VIsual.lnum != wp->w_old_visual_lnum
					|| VIsual.col != wp->w_old_visual_col)
		{
		    if (wp->w_old_visual_lnum < from
						&& wp->w_old_visual_lnum != 0)
			from = wp->w_old_visual_lnum;
		    if (wp->w_old_visual_lnum > to)
			to = wp->w_old_visual_lnum;
		    if (VIsual.lnum < from)
			from = VIsual.lnum;
		    if (VIsual.lnum > to)
			to = VIsual.lnum;
		}
	    }

	    // If in block mode and changed column or curwin->w_curswant:
	    // update all lines.
	    // First compute the actual start and end column.
	    if (VIsual_mode == Ctrl_V)
	    {
		colnr_T	    fromc, toc;
#if defined(FEAT_LINEBREAK)
		int	    save_ve_flags = ve_flags;

		if (curwin->w_p_lbr)
		    ve_flags = VE_ALL;
#endif
		getvcols(wp, &VIsual, &curwin->w_cursor, &fromc, &toc);
#if defined(FEAT_LINEBREAK)
		ve_flags = save_ve_flags;
#endif
		++toc;
		if (curwin->w_curswant == MAXCOL)
		    toc = MAXCOL;

		if (fromc != wp->w_old_cursor_fcol
			|| toc != wp->w_old_cursor_lcol)
		{
		    if (from > VIsual.lnum)
			from = VIsual.lnum;
		    if (to < VIsual.lnum)
			to = VIsual.lnum;
		}
		wp->w_old_cursor_fcol = fromc;
		wp->w_old_cursor_lcol = toc;
	    }
	}
	else
	{
	    // Use the line numbers of the old Visual area.
	    if (wp->w_old_cursor_lnum < wp->w_old_visual_lnum)
	    {
		from = wp->w_old_cursor_lnum;
		to = wp->w_old_visual_lnum;
	    }
	    else
	    {
		from = wp->w_old_visual_lnum;
		to = wp->w_old_cursor_lnum;
	    }
	}

	// There is no need to update lines above the top of the window.
	if (from < wp->w_topline)
	    from = wp->w_topline;

	// If we know the value of w_botline, use it to restrict the update to
	// the lines that are visible in the window.
	if (wp->w_valid & VALID_BOTLINE)
	{
	    if (from >= wp->w_botline)
		from = wp->w_botline - 1;
	    if (to >= wp->w_botline)
		to = wp->w_botline - 1;
	}

	// Find the minimal part to be updated.
	// Watch out for scrolling that made entries in w_lines[] invalid.
	// E.g., CTRL-U makes the first half of w_lines[] invalid and sets
	// top_end; need to redraw from top_end to the "to" line.
	// A middle mouse click with a Visual selection may change the text
	// above the Visual area and reset wl_valid, do count these for
	// mid_end (in srow).
	if (mid_start > 0)
	{
	    lnum = wp->w_topline;
	    idx = 0;
	    srow = 0;
	    if (scrolled_down)
		mid_start = top_end;
	    else
		mid_start = 0;
	    while (lnum < from && idx < wp->w_lines_valid)	// find start
	    {
		if (wp->w_lines[idx].wl_valid)
		    mid_start += wp->w_lines[idx].wl_size;
		else if (!scrolled_down)
		    srow += wp->w_lines[idx].wl_size;
		++idx;
# ifdef FEAT_FOLDING
		if (idx < wp->w_lines_valid && wp->w_lines[idx].wl_valid)
		    lnum = wp->w_lines[idx].wl_lnum;
		else
# endif
		    ++lnum;
	    }
	    srow += mid_start;
	    mid_end = wp->w_height;
	    for ( ; idx < wp->w_lines_valid; ++idx)		// find end
	    {
		if (wp->w_lines[idx].wl_valid
			&& wp->w_lines[idx].wl_lnum >= to + 1)
		{
		    // Only update until first row of this line
		    mid_end = srow;
		    break;
		}
		srow += wp->w_lines[idx].wl_size;
	    }
	}
    }

    if (VIsual_active && buf == curwin->w_buffer)
    {
	wp->w_old_visual_mode = VIsual_mode;
	wp->w_old_cursor_lnum = curwin->w_cursor.lnum;
	wp->w_old_visual_lnum = VIsual.lnum;
	wp->w_old_visual_col = VIsual.col;
	wp->w_old_curswant = curwin->w_curswant;
    }
    else
    {
	wp->w_old_visual_mode = 0;
	wp->w_old_cursor_lnum = 0;
	wp->w_old_visual_lnum = 0;
	wp->w_old_visual_col = 0;
    }

#if defined(FEAT_SYN_HL) || defined(FEAT_SEARCH_EXTRA)
    // reset got_int, otherwise regexp won't work
    save_got_int = got_int;
    got_int = 0;
#endif
#ifdef SYN_TIME_LIMIT
    // Set the time limit to 'redrawtime'.
    profile_setlimit(p_rdt, &syntax_tm);
    syn_set_timeout(&syntax_tm);
#endif
#ifdef FEAT_FOLDING
    win_foldinfo.fi_level = 0;
#endif

#ifdef FEAT_MENU
    // Draw the window toolbar, if there is one.
    // TODO: only when needed.
    if (winbar_height(wp) > 0)
	redraw_win_toolbar(wp);
#endif

    // Update all the window rows.
    idx = 0;		// first entry in w_lines[].wl_size
    row = 0;
    srow = 0;
    lnum = wp->w_topline;	// first line shown in window
    for (;;)
    {
	// stop updating when reached the end of the window (check for _past_
	// the end of the window is at the end of the loop)
	if (row == wp->w_height)
	{
	    didline = TRUE;
	    break;
	}

	// stop updating when hit the end of the file
	if (lnum > buf->b_ml.ml_line_count)
	{
	    eof = TRUE;
	    break;
	}

	// Remember the starting row of the line that is going to be dealt
	// with.  It is used further down when the line doesn't fit.
	srow = row;

	// Update a line when it is in an area that needs updating, when it
	// has changes or w_lines[idx] is invalid.
	// "bot_start" may be halfway a wrapped line after using
	// win_del_lines(), check if the current line includes it.
	// When syntax folding is being used, the saved syntax states will
	// already have been updated, we can't see where the syntax state is
	// the same again, just update until the end of the window.
	if (row < top_end
		|| (row >= mid_start && row < mid_end)
#ifdef FEAT_SEARCH_EXTRA
		|| top_to_mod
#endif
		|| idx >= wp->w_lines_valid
		|| (row + wp->w_lines[idx].wl_size > bot_start)
		|| (mod_top != 0
		    && (lnum == mod_top
			|| (lnum >= mod_top
			    && (lnum < mod_bot
#ifdef FEAT_SYN_HL
				|| did_update == DID_FOLD
				|| (did_update == DID_LINE
				    && syntax_present(wp)
				    && (
# ifdef FEAT_FOLDING
					(foldmethodIsSyntax(wp)
						      && hasAnyFolding(wp)) ||
# endif
					syntax_check_changed(lnum)))
#endif
#ifdef FEAT_SEARCH_EXTRA
				// match in fixed position might need redraw
				// if lines were inserted or deleted
				|| (wp->w_match_head != NULL
						    && buf->b_mod_xlines != 0)
#endif
				))))
#ifdef FEAT_SYN_HL
		|| (wp->w_p_cul && (lnum == wp->w_cursor.lnum
					     || lnum == wp->w_last_cursorline))
#endif
				)
	{
#ifdef FEAT_SEARCH_EXTRA
	    if (lnum == mod_top)
		top_to_mod = FALSE;
#endif

	    // When at start of changed lines: May scroll following lines
	    // up or down to minimize redrawing.
	    // Don't do this when the change continues until the end.
	    // Don't scroll when dollar_vcol >= 0, keep the "$".
	    if (lnum == mod_top
		    && mod_bot != MAXLNUM
		    && !(dollar_vcol >= 0 && mod_bot == mod_top + 1))
	    {
		int		old_rows = 0;
		int		new_rows = 0;
		int		xtra_rows;
		linenr_T	l;

		// Count the old number of window rows, using w_lines[], which
		// should still contain the sizes for the lines as they are
		// currently displayed.
		for (i = idx; i < wp->w_lines_valid; ++i)
		{
		    // Only valid lines have a meaningful wl_lnum.  Invalid
		    // lines are part of the changed area.
		    if (wp->w_lines[i].wl_valid
			    && wp->w_lines[i].wl_lnum == mod_bot)
			break;
		    old_rows += wp->w_lines[i].wl_size;
#ifdef FEAT_FOLDING
		    if (wp->w_lines[i].wl_valid
			    && wp->w_lines[i].wl_lastlnum + 1 == mod_bot)
		    {
			// Must have found the last valid entry above mod_bot.
			// Add following invalid entries.
			++i;
			while (i < wp->w_lines_valid
						  && !wp->w_lines[i].wl_valid)
			    old_rows += wp->w_lines[i++].wl_size;
			break;
		    }
#endif
		}

		if (i >= wp->w_lines_valid)
		{
		    // We can't find a valid line below the changed lines,
		    // need to redraw until the end of the window.
		    // Inserting/deleting lines has no use.
		    bot_start = 0;
		}
		else
		{
		    // Able to count old number of rows: Count new window
		    // rows, and may insert/delete lines
		    j = idx;
		    for (l = lnum; l < mod_bot; ++l)
		    {
#ifdef FEAT_FOLDING
			if (hasFoldingWin(wp, l, NULL, &l, TRUE, NULL))
			    ++new_rows;
			else
#endif
#ifdef FEAT_DIFF
			    if (l == wp->w_topline)
			    new_rows += plines_win_nofill(wp, l, TRUE)
							      + wp->w_topfill;
			else
#endif
			    new_rows += plines_win(wp, l, TRUE);
			++j;
			if (new_rows > wp->w_height - row - 2)
			{
			    // it's getting too much, must redraw the rest
			    new_rows = 9999;
			    break;
			}
		    }
		    xtra_rows = new_rows - old_rows;
		    if (xtra_rows < 0)
		    {
			// May scroll text up.  If there is not enough
			// remaining text or scrolling fails, must redraw the
			// rest.  If scrolling works, must redraw the text
			// below the scrolled text.
			if (row - xtra_rows >= wp->w_height - 2)
			    mod_bot = MAXLNUM;
			else
			{
			    check_for_delay(FALSE);
			    if (win_del_lines(wp, row,
					  -xtra_rows, FALSE, FALSE, 0) == FAIL)
				mod_bot = MAXLNUM;
			    else
				bot_start = wp->w_height + xtra_rows;
			}
		    }
		    else if (xtra_rows > 0)
		    {
			// May scroll text down.  If there is not enough
			// remaining text of scrolling fails, must redraw the
			// rest.
			if (row + xtra_rows >= wp->w_height - 2)
			    mod_bot = MAXLNUM;
			else
			{
			    check_for_delay(FALSE);
			    if (win_ins_lines(wp, row + old_rows,
					     xtra_rows, FALSE, FALSE) == FAIL)
				mod_bot = MAXLNUM;
			    else if (top_end > row + old_rows)
				// Scrolled the part at the top that requires
				// updating down.
				top_end += xtra_rows;
			}
		    }

		    // When not updating the rest, may need to move w_lines[]
		    // entries.
		    if (mod_bot != MAXLNUM && i != j)
		    {
			if (j < i)
			{
			    int x = row + new_rows;

			    // move entries in w_lines[] upwards
			    for (;;)
			    {
				// stop at last valid entry in w_lines[]
				if (i >= wp->w_lines_valid)
				{
				    wp->w_lines_valid = j;
				    break;
				}
				wp->w_lines[j] = wp->w_lines[i];
				// stop at a line that won't fit
				if (x + (int)wp->w_lines[j].wl_size
							   > wp->w_height)
				{
				    wp->w_lines_valid = j + 1;
				    break;
				}
				x += wp->w_lines[j++].wl_size;
				++i;
			    }
			    if (bot_start > x)
				bot_start = x;
			}
			else // j > i
			{
			    // move entries in w_lines[] downwards
			    j -= i;
			    wp->w_lines_valid += j;
			    if (wp->w_lines_valid > wp->w_height)
				wp->w_lines_valid = wp->w_height;
			    for (i = wp->w_lines_valid; i - j >= idx; --i)
				wp->w_lines[i] = wp->w_lines[i - j];

			    // The w_lines[] entries for inserted lines are
			    // now invalid, but wl_size may be used above.
			    // Reset to zero.
			    while (i >= idx)
			    {
				wp->w_lines[i].wl_size = 0;
				wp->w_lines[i--].wl_valid = FALSE;
			    }
			}
		    }
		}
	    }

#ifdef FEAT_FOLDING
	    // When lines are folded, display one line for all of them.
	    // Otherwise, display normally (can be several display lines when
	    // 'wrap' is on).
	    fold_count = foldedCount(wp, lnum, &win_foldinfo);
	    if (fold_count != 0)
	    {
		fold_line(wp, fold_count, &win_foldinfo, lnum, row);
		++row;
		--fold_count;
		wp->w_lines[idx].wl_folded = TRUE;
		wp->w_lines[idx].wl_lastlnum = lnum + fold_count;
# ifdef FEAT_SYN_HL
		did_update = DID_FOLD;
# endif
	    }
	    else
#endif
	    if (idx < wp->w_lines_valid
		    && wp->w_lines[idx].wl_valid
		    && wp->w_lines[idx].wl_lnum == lnum
		    && lnum > wp->w_topline
		    && !(dy_flags & (DY_LASTLINE | DY_TRUNCATE))
		    && !WIN_IS_POPUP(wp)
		    && srow + wp->w_lines[idx].wl_size > wp->w_height
#ifdef FEAT_DIFF
		    && diff_check_fill(wp, lnum) == 0
#endif
		    )
	    {
		// This line is not going to fit.  Don't draw anything here,
		// will draw "@  " lines below.
		row = wp->w_height + 1;
	    }
	    else
	    {
#ifdef FEAT_SEARCH_EXTRA
		prepare_search_hl(wp, &screen_search_hl, lnum);
#endif
#ifdef FEAT_SYN_HL
		// Let the syntax stuff know we skipped a few lines.
		if (syntax_last_parsed != 0 && syntax_last_parsed + 1 < lnum
						       && syntax_present(wp))
		    syntax_end_parsing(syntax_last_parsed + 1);
#endif

		// Display one line.
		row = win_line(wp, lnum, srow, wp->w_height,
							  mod_top == 0, FALSE);

#ifdef FEAT_FOLDING
		wp->w_lines[idx].wl_folded = FALSE;
		wp->w_lines[idx].wl_lastlnum = lnum;
#endif
#ifdef FEAT_SYN_HL
		did_update = DID_LINE;
		syntax_last_parsed = lnum;
#endif
	    }

	    wp->w_lines[idx].wl_lnum = lnum;
	    wp->w_lines[idx].wl_valid = TRUE;

	    // Past end of the window or end of the screen. Note that after
	    // resizing wp->w_height may be end up too big. That's a problem
	    // elsewhere, but prevent a crash here.
	    if (row > wp->w_height || row + wp->w_winrow >= Rows)
	    {
		// we may need the size of that too long line later on
		if (dollar_vcol == -1)
		    wp->w_lines[idx].wl_size = plines_win(wp, lnum, TRUE);
		++idx;
		break;
	    }
	    if (dollar_vcol == -1)
		wp->w_lines[idx].wl_size = row - srow;
	    ++idx;
#ifdef FEAT_FOLDING
	    lnum += fold_count + 1;
#else
	    ++lnum;
#endif
	}
	else
	{
	    if (wp->w_p_rnu)
	    {
#ifdef FEAT_FOLDING
		// 'relativenumber' set: The text doesn't need to be drawn, but
		// the number column nearly always does.
		fold_count = foldedCount(wp, lnum, &win_foldinfo);
		if (fold_count != 0)
		    fold_line(wp, fold_count, &win_foldinfo, lnum, row);
		else
#endif
		    (void)win_line(wp, lnum, srow, wp->w_height, TRUE, TRUE);
	    }

	    // This line does not need to be drawn, advance to the next one.
	    row += wp->w_lines[idx++].wl_size;
	    if (row > wp->w_height)	// past end of screen
		break;
#ifdef FEAT_FOLDING
	    lnum = wp->w_lines[idx - 1].wl_lastlnum + 1;
#else
	    ++lnum;
#endif
#ifdef FEAT_SYN_HL
	    did_update = DID_NONE;
#endif
	}

	if (lnum > buf->b_ml.ml_line_count)
	{
	    eof = TRUE;
	    break;
	}
    }

    // End of loop over all window lines.

#ifdef FEAT_VTP
    // Rewrite the character at the end of the screen line.
    if (use_vtp())
    {
	int i;

	for (i = 0; i < Rows; ++i)
	    if (enc_utf8)
		if ((*mb_off2cells)(LineOffset[i] + Columns - 2,
					   LineOffset[i] + screen_Columns) > 1)
		    screen_draw_rectangle(i, Columns - 2, 1, 2, FALSE);
		else
		    screen_draw_rectangle(i, Columns - 1, 1, 1, FALSE);
	    else
		screen_char(LineOffset[i] + Columns - 1, i, Columns - 1);
    }
#endif

    if (idx > wp->w_lines_valid)
	wp->w_lines_valid = idx;

#ifdef FEAT_SYN_HL
    // Let the syntax stuff know we stop parsing here.
    if (syntax_last_parsed != 0 && syntax_present(wp))
	syntax_end_parsing(syntax_last_parsed + 1);
#endif

    // If we didn't hit the end of the file, and we didn't finish the last
    // line we were working on, then the line didn't fit.
    wp->w_empty_rows = 0;
#ifdef FEAT_DIFF
    wp->w_filler_rows = 0;
#endif
    if (!eof && !didline)
    {
	if (lnum == wp->w_topline)
	{
	    // Single line that does not fit!
	    // Don't overwrite it, it can be edited.
	    wp->w_botline = lnum + 1;
	}
#ifdef FEAT_DIFF
	else if (diff_check_fill(wp, lnum) >= wp->w_height - srow)
	{
	    // Window ends in filler lines.
	    wp->w_botline = lnum;
	    wp->w_filler_rows = wp->w_height - srow;
	}
#endif
#ifdef FEAT_PROP_POPUP
	else if (WIN_IS_POPUP(wp))
	{
	    // popup line that doesn't fit is left as-is
	    wp->w_botline = lnum;
	}
#endif
	else if (dy_flags & DY_TRUNCATE)	// 'display' has "truncate"
	{
	    int scr_row = W_WINROW(wp) + wp->w_height - 1;

	    // Last line isn't finished: Display "@@@" in the last screen line.
	    screen_puts_len((char_u *)"@@", 2, scr_row, wp->w_wincol,
							      HL_ATTR(HLF_AT));
	    screen_fill(scr_row, scr_row + 1,
		    (int)wp->w_wincol + 2, (int)W_ENDCOL(wp),
		    '@', ' ', HL_ATTR(HLF_AT));
	    set_empty_rows(wp, srow);
	    wp->w_botline = lnum;
	}
	else if (dy_flags & DY_LASTLINE)	// 'display' has "lastline"
	{
	    // Last line isn't finished: Display "@@@" at the end.
	    screen_fill(W_WINROW(wp) + wp->w_height - 1,
		    W_WINROW(wp) + wp->w_height,
		    (int)W_ENDCOL(wp) - 3, (int)W_ENDCOL(wp),
		    '@', '@', HL_ATTR(HLF_AT));
	    set_empty_rows(wp, srow);
	    wp->w_botline = lnum;
	}
	else
	{
	    win_draw_end(wp, '@', ' ', TRUE, srow, wp->w_height, HLF_AT);
	    wp->w_botline = lnum;
	}
    }
    else
    {
	draw_vsep_win(wp, row);
	if (eof)		// we hit the end of the file
	{
	    wp->w_botline = buf->b_ml.ml_line_count + 1;
#ifdef FEAT_DIFF
	    j = diff_check_fill(wp, wp->w_botline);
	    if (j > 0 && !wp->w_botfill)
	    {
		// Display filler lines at the end of the file.
		if (char2cells(fill_diff) > 1)
		    i = '-';
		else
		    i = fill_diff;
		if (row + j > wp->w_height)
		    j = wp->w_height - row;
		win_draw_end(wp, i, i, TRUE, row, row + (int)j, HLF_DED);
		row += j;
	    }
#endif
	}
	else if (dollar_vcol == -1)
	    wp->w_botline = lnum;

	// Make sure the rest of the screen is blank
	// put '~'s on rows that aren't part of the file.
	if (WIN_IS_POPUP(wp))
	    win_draw_end(wp, ' ', ' ', FALSE, row, wp->w_height, HLF_AT);
	else
	    win_draw_end(wp, '~', ' ', FALSE, row, wp->w_height, HLF_EOB);
    }

#ifdef SYN_TIME_LIMIT
    syn_set_timeout(NULL);
#endif

    // Reset the type of redrawing required, the window has been updated.
    wp->w_redr_type = 0;
#ifdef FEAT_DIFF
    wp->w_old_topfill = wp->w_topfill;
    wp->w_old_botfill = wp->w_botfill;
#endif

    if (dollar_vcol == -1)
    {
	// There is a trick with w_botline.  If we invalidate it on each
	// change that might modify it, this will cause a lot of expensive
	// calls to plines() in update_topline() each time.  Therefore the
	// value of w_botline is often approximated, and this value is used to
	// compute the value of w_topline.  If the value of w_botline was
	// wrong, check that the value of w_topline is correct (cursor is on
	// the visible part of the text).  If it's not, we need to redraw
	// again.  Mostly this just means scrolling up a few lines, so it
	// doesn't look too bad.  Only do this for the current window (where
	// changes are relevant).
	wp->w_valid |= VALID_BOTLINE;
	if (wp == curwin && wp->w_botline != old_botline && !recursive)
	{
	    win_T	*wwp;
#if defined(FEAT_CONCEAL)
	    linenr_T	old_topline = wp->w_topline;
	    int		new_wcol = wp->w_wcol;
#endif
	    recursive = TRUE;
	    curwin->w_valid &= ~VALID_TOPLINE;
	    update_topline();	// may invalidate w_botline again

#if defined(FEAT_CONCEAL)
	    if (old_wcol != new_wcol && (wp->w_valid & (VALID_WCOL|VALID_WROW))
						    != (VALID_WCOL|VALID_WROW))
	    {
		// A win_line() call applied a fix to screen cursor column to
		// accommodate concealment of cursor line, but in this call to
		// update_topline() the cursor's row or column got invalidated.
		// If they are left invalid, setcursor() will recompute them
		// but there won't be any further win_line() call to re-fix the
		// column and the cursor will end up misplaced.  So we call
		// cursor validation now and reapply the fix again (or call
		// win_line() to do it for us).
		validate_cursor();
		if (wp->w_wcol == old_wcol && wp->w_wrow == old_wrow
					       && old_topline == wp->w_topline)
		    wp->w_wcol = new_wcol;
		else
		    redrawWinline(wp, wp->w_cursor.lnum);
	    }
#endif
	    // New redraw either due to updated topline or due to wcol fix.
	    if (wp->w_redr_type != 0)
	    {
		// Don't update for changes in buffer again.
		i = curbuf->b_mod_set;
		curbuf->b_mod_set = FALSE;
		j = curbuf->b_mod_xlines;
		curbuf->b_mod_xlines = 0;
		win_update(curwin);
		curbuf->b_mod_set = i;
		curbuf->b_mod_xlines = j;
	    }
	    // Other windows might have w_redr_type raised in update_topline().
	    must_redraw = 0;
	    FOR_ALL_WINDOWS(wwp)
		if (wwp->w_redr_type > must_redraw)
		    must_redraw = wwp->w_redr_type;
	    recursive = FALSE;
	}
    }

#if defined(FEAT_SYN_HL) || defined(FEAT_SEARCH_EXTRA)
    // restore got_int, unless CTRL-C was hit while redrawing
    if (!got_int)
	got_int = save_got_int;
#endif
}

#if defined(FEAT_NETBEANS_INTG) || defined(FEAT_GUI)
/*
 * Prepare for updating one or more windows.
 * Caller must check for "updating_screen" already set to avoid recursiveness.
 */
    static void
update_prepare(void)
{
    cursor_off();
    updating_screen = TRUE;
#ifdef FEAT_GUI
    // Remove the cursor before starting to do anything, because scrolling may
    // make it difficult to redraw the text under it.
    if (gui.in_use)
	gui_undraw_cursor();
#endif
#ifdef FEAT_SEARCH_EXTRA
    start_search_hl();
#endif
#ifdef FEAT_PROP_POPUP
    // Update popup_mask if needed.
    may_update_popup_mask(must_redraw);
#endif
}

/*
 * Finish updating one or more windows.
 */
    static void
update_finish(void)
{
    if (redraw_cmdline || redraw_mode)
	showmode();

# ifdef FEAT_SEARCH_EXTRA
    end_search_hl();
# endif

    after_updating_screen(TRUE);

# ifdef FEAT_GUI
    // Redraw the cursor and update the scrollbars when all screen updating is
    // done.
    if (gui.in_use)
    {
	out_flush_cursor(FALSE, FALSE);
	gui_update_scrollbars(FALSE);
    }
# endif
}
#endif

#if defined(FEAT_NETBEANS_INTG) || defined(PROTO)
    void
update_debug_sign(buf_T *buf, linenr_T lnum)
{
    win_T	*wp;
    int		doit = FALSE;

# ifdef FEAT_FOLDING
    win_foldinfo.fi_level = 0;
# endif

    // update/delete a specific sign
    redraw_buf_line_later(buf, lnum);

    // check if it resulted in the need to redraw a window
    FOR_ALL_WINDOWS(wp)
	if (wp->w_redr_type != 0)
	    doit = TRUE;

    // Return when there is nothing to do, screen updating is already
    // happening (recursive call), messages on the screen or still starting up.
    if (!doit || updating_screen
	    || State == ASKMORE || State == HITRETURN
	    || msg_scrolled
#ifdef FEAT_GUI
	    || gui.starting
#endif
	    || starting)
	return;

    // update all windows that need updating
    update_prepare();

    FOR_ALL_WINDOWS(wp)
    {
	if (wp->w_redr_type != 0)
	    win_update(wp);
	if (wp->w_redr_status)
	    win_redr_status(wp, FALSE);
    }

    update_finish();
}
#endif

#if defined(FEAT_GUI) || defined(PROTO)
/*
 * Update a single window, its status line and maybe the command line msg.
 * Used for the GUI scrollbar.
 */
    void
updateWindow(win_T *wp)
{
    // return if already busy updating
    if (updating_screen)
	return;

    update_prepare();

#ifdef FEAT_CLIPBOARD
    // When Visual area changed, may have to update selection.
    if (clip_star.available && clip_isautosel_star())
	clip_update_selection(&clip_star);
    if (clip_plus.available && clip_isautosel_plus())
	clip_update_selection(&clip_plus);
#endif

    win_update(wp);

    // When the screen was cleared redraw the tab pages line.
    if (redraw_tabline)
	draw_tabline();

    if (wp->w_redr_status
# ifdef FEAT_CMDL_INFO
	    || p_ru
# endif
# ifdef FEAT_STL_OPT
	    || *p_stl != NUL || *wp->w_p_stl != NUL
# endif
	    )
	win_redr_status(wp, FALSE);

#ifdef FEAT_PROP_POPUP
    // Display popup windows on top of everything.
    update_popups(win_update);
#endif

    update_finish();
}
#endif

#if defined(FEAT_TERMRESPONSE) || defined(PROTO)
/*
 * Redraw as soon as possible.  When the command line is not scrolled redraw
 * right away and restore what was on the command line.
 * Return a code indicating what happened.
 */
    int
redraw_asap(int type)
{
    int		rows;
    int		cols = screen_Columns;
    int		r;
    int		ret = 0;
    schar_T	*screenline;	// copy from ScreenLines[]
    sattr_T	*screenattr;	// copy from ScreenAttrs[]
    int		i;
    u8char_T	*screenlineUC = NULL;	// copy from ScreenLinesUC[]
    u8char_T	*screenlineC[MAX_MCO];	// copy from ScreenLinesC[][]
    schar_T	*screenline2 = NULL;	// copy from ScreenLines2[]

    redraw_later(type);
    if (msg_scrolled || (State != NORMAL && State != NORMAL_BUSY) || exiting)
	return ret;

    // Allocate space to save the text displayed in the command line area.
    rows = screen_Rows - cmdline_row;
    screenline = LALLOC_MULT(schar_T, rows * cols);
    screenattr = LALLOC_MULT(sattr_T, rows * cols);
    if (screenline == NULL || screenattr == NULL)
	ret = 2;
    if (enc_utf8)
    {
	screenlineUC = LALLOC_MULT(u8char_T, rows * cols);
	if (screenlineUC == NULL)
	    ret = 2;
	for (i = 0; i < p_mco; ++i)
	{
	    screenlineC[i] = LALLOC_MULT(u8char_T, rows * cols);
	    if (screenlineC[i] == NULL)
		ret = 2;
	}
    }
    if (enc_dbcs == DBCS_JPNU)
    {
	screenline2 = LALLOC_MULT(schar_T, rows * cols);
	if (screenline2 == NULL)
	    ret = 2;
    }

    if (ret != 2)
    {
	// Save the text displayed in the command line area.
	for (r = 0; r < rows; ++r)
	{
	    mch_memmove(screenline + r * cols,
			ScreenLines + LineOffset[cmdline_row + r],
			(size_t)cols * sizeof(schar_T));
	    mch_memmove(screenattr + r * cols,
			ScreenAttrs + LineOffset[cmdline_row + r],
			(size_t)cols * sizeof(sattr_T));
	    if (enc_utf8)
	    {
		mch_memmove(screenlineUC + r * cols,
			    ScreenLinesUC + LineOffset[cmdline_row + r],
			    (size_t)cols * sizeof(u8char_T));
		for (i = 0; i < p_mco; ++i)
		    mch_memmove(screenlineC[i] + r * cols,
				ScreenLinesC[i] + LineOffset[cmdline_row + r],
				(size_t)cols * sizeof(u8char_T));
	    }
	    if (enc_dbcs == DBCS_JPNU)
		mch_memmove(screenline2 + r * cols,
			    ScreenLines2 + LineOffset[cmdline_row + r],
			    (size_t)cols * sizeof(schar_T));
	}

	update_screen(0);
	ret = 3;

	if (must_redraw == 0)
	{
	    int	off = (int)(current_ScreenLine - ScreenLines);

	    // Restore the text displayed in the command line area.
	    for (r = 0; r < rows; ++r)
	    {
		mch_memmove(current_ScreenLine,
			    screenline + r * cols,
			    (size_t)cols * sizeof(schar_T));
		mch_memmove(ScreenAttrs + off,
			    screenattr + r * cols,
			    (size_t)cols * sizeof(sattr_T));
		if (enc_utf8)
		{
		    mch_memmove(ScreenLinesUC + off,
				screenlineUC + r * cols,
				(size_t)cols * sizeof(u8char_T));
		    for (i = 0; i < p_mco; ++i)
			mch_memmove(ScreenLinesC[i] + off,
				    screenlineC[i] + r * cols,
				    (size_t)cols * sizeof(u8char_T));
		}
		if (enc_dbcs == DBCS_JPNU)
		    mch_memmove(ScreenLines2 + off,
				screenline2 + r * cols,
				(size_t)cols * sizeof(schar_T));
		screen_line(cmdline_row + r, 0, cols, cols, 0);
	    }
	    ret = 4;
	}
    }

    vim_free(screenline);
    vim_free(screenattr);
    if (enc_utf8)
    {
	vim_free(screenlineUC);
	for (i = 0; i < p_mco; ++i)
	    vim_free(screenlineC[i]);
    }
    if (enc_dbcs == DBCS_JPNU)
	vim_free(screenline2);

    // Show the intro message when appropriate.
    maybe_intro_message();

    setcursor();

    return ret;
}
#endif

/*
 * Invoked after an asynchronous callback is called.
 * If an echo command was used the cursor needs to be put back where
 * it belongs. If highlighting was changed a redraw is needed.
 * If "call_update_screen" is FALSE don't call update_screen() when at the
 * command line.
 */
    void
redraw_after_callback(int call_update_screen)
{
    ++redrawing_for_callback;

    if (State == HITRETURN || State == ASKMORE)
	; // do nothing
    else if (State & CMDLINE)
    {
	// Don't redraw when in prompt_for_number().
	if (cmdline_row > 0)
	{
	    // Redrawing only works when the screen didn't scroll. Don't clear
	    // wildmenu entries.
	    if (msg_scrolled == 0
#ifdef FEAT_WILDMENU
		    && wild_menu_showing == 0
#endif
		    && call_update_screen)
		update_screen(0);

	    // Redraw in the same position, so that the user can continue
	    // editing the command.
	    redrawcmdline_ex(FALSE);
	}
    }
    else if (State & (NORMAL | INSERT | TERMINAL))
    {
	// keep the command line if possible
	update_screen(VALID_NO_UPDATE);
	setcursor();
    }
    cursor_on();
#ifdef FEAT_GUI
    if (gui.in_use && !gui_mch_is_blink_off())
	// Don't update the cursor when it is blinking and off to avoid
	// flicker.
	out_flush_cursor(FALSE, FALSE);
    else
#endif
	out_flush();

    --redrawing_for_callback;
}

/*
 * Redraw the current window later, with update_screen(type).
 * Set must_redraw only if not already set to a higher value.
 * E.g. if must_redraw is CLEAR, type NOT_VALID will do nothing.
 */
    void
redraw_later(int type)
{
    redraw_win_later(curwin, type);
}

    void
redraw_win_later(
    win_T	*wp,
    int		type)
{
    if (!exiting && wp->w_redr_type < type)
    {
	wp->w_redr_type = type;
	if (type >= NOT_VALID)
	    wp->w_lines_valid = 0;
	if (must_redraw < type)	// must_redraw is the maximum of all windows
	    must_redraw = type;
    }
}

/*
 * Force a complete redraw later.  Also resets the highlighting.  To be used
 * after executing a shell command that messes up the screen.
 */
    void
redraw_later_clear(void)
{
    redraw_all_later(CLEAR);
    reset_screen_attr();
}

/*
 * Mark all windows to be redrawn later.
 */
    void
redraw_all_later(int type)
{
    win_T	*wp;

    FOR_ALL_WINDOWS(wp)
	redraw_win_later(wp, type);
    // This may be needed when switching tabs.
    if (must_redraw < type)
	must_redraw = type;
}

/*
 * Mark all windows that are editing the current buffer to be updated later.
 */
    void
redraw_curbuf_later(int type)
{
    redraw_buf_later(curbuf, type);
}

    void
redraw_buf_later(buf_T *buf, int type)
{
    win_T	*wp;

    FOR_ALL_WINDOWS(wp)
    {
	if (wp->w_buffer == buf)
	    redraw_win_later(wp, type);
    }
#if defined(FEAT_TERMINAL) && defined(FEAT_PROP_POPUP)
    // terminal in popup window is not in list of windows
    if (curwin->w_buffer == buf)
	redraw_win_later(curwin, type);
#endif
}

#if defined(FEAT_SIGNS) || defined(PROTO)
    void
redraw_buf_line_later(buf_T *buf, linenr_T lnum)
{
    win_T	*wp;

    FOR_ALL_WINDOWS(wp)
	if (wp->w_buffer == buf && lnum >= wp->w_topline
						  && lnum < wp->w_botline)
	    redrawWinline(wp, lnum);
}
#endif

#if defined(FEAT_JOB_CHANNEL) || defined(PROTO)
    void
redraw_buf_and_status_later(buf_T *buf, int type)
{
    win_T	*wp;

#ifdef FEAT_WILDMENU
    if (wild_menu_showing != 0)
	// Don't redraw while the command line completion is displayed, it
	// would disappear.
	return;
#endif
    FOR_ALL_WINDOWS(wp)
    {
	if (wp->w_buffer == buf)
	{
	    redraw_win_later(wp, type);
	    wp->w_redr_status = TRUE;
	}
    }
}
#endif

/*
 * mark all status lines for redraw; used after first :cd
 */
    void
status_redraw_all(void)
{
    win_T	*wp;

    FOR_ALL_WINDOWS(wp)
	if (wp->w_status_height)
	{
	    wp->w_redr_status = TRUE;
	    redraw_later(VALID);
	}
}

/*
 * mark all status lines of the current buffer for redraw
 */
    void
status_redraw_curbuf(void)
{
    win_T	*wp;

    FOR_ALL_WINDOWS(wp)
	if (wp->w_status_height != 0 && wp->w_buffer == curbuf)
	{
	    wp->w_redr_status = TRUE;
	    redraw_later(VALID);
	}
}

/*
 * Redraw all status lines that need to be redrawn.
 */
    void
redraw_statuslines(void)
{
    win_T	*wp;

    FOR_ALL_WINDOWS(wp)
	if (wp->w_redr_status)
	    win_redr_status(wp, FALSE);
    if (redraw_tabline)
	draw_tabline();
}

#if defined(FEAT_WILDMENU) || defined(PROTO)
/*
 * Redraw all status lines at the bottom of frame "frp".
 */
    void
win_redraw_last_status(frame_T *frp)
{
    if (frp->fr_layout == FR_LEAF)
	frp->fr_win->w_redr_status = TRUE;
    else if (frp->fr_layout == FR_ROW)
    {
	FOR_ALL_FRAMES(frp, frp->fr_child)
	    win_redraw_last_status(frp);
    }
    else // frp->fr_layout == FR_COL
    {
	frp = frp->fr_child;
	while (frp->fr_next != NULL)
	    frp = frp->fr_next;
	win_redraw_last_status(frp);
    }
}
#endif

/*
 * Changed something in the current window, at buffer line "lnum", that
 * requires that line and possibly other lines to be redrawn.
 * Used when entering/leaving Insert mode with the cursor on a folded line.
 * Used to remove the "$" from a change command.
 * Note that when also inserting/deleting lines w_redraw_top and w_redraw_bot
 * may become invalid and the whole window will have to be redrawn.
 */
    void
redrawWinline(
    win_T	*wp,
    linenr_T	lnum)
{
    if (wp->w_redraw_top == 0 || wp->w_redraw_top > lnum)
	wp->w_redraw_top = lnum;
    if (wp->w_redraw_bot == 0 || wp->w_redraw_bot < lnum)
	wp->w_redraw_bot = lnum;
    redraw_win_later(wp, VALID);
}