patch 8.2.4520: using wrong highlight for cursor line numberv8.2.4520

Problem:    Using wrong highlight for cursor line number.
Solution:   Take filler lines into account when using CursorLineNr.
            (closes #9897)

5 files changed, 71 insertions, 2 deletions

diff --git a/src/drawline.c b/src/drawline.c
index a55c06dc9..6a5c28df1 100644
--- a/src/drawline.c
+++ b/src/drawline.c
@@ -1194,8 +1194,9 @@ win_line(
 		      if (wp->w_p_cul
 			      && lnum == wp->w_cursor.lnum
 			      && (wp->w_p_culopt_flags & CULOPT_NBR)
-			      && (row == startrow
-				  || wp->w_p_culopt_flags & CULOPT_LINE))
+			      && (row == startrow + filler_lines
+				  || (row > startrow + filler_lines
+				      && wp->w_p_culopt_flags & CULOPT_LINE)))
 			char_attr = hl_combine_attr(wcr_attr, HL_ATTR(HLF_CLN));
 #endif
 		      if (wp->w_p_rnu && lnum < wp->w_cursor.lnum
diff --git a/src/testdir/dumps/Test_diff_with_cursorline_number_01.dump b/src/testdir/dumps/Test_diff_with_cursorline_number_01.dump
new file mode 100644
index 000000000..82892105e
--- /dev/null
+++ b/src/testdir/dumps/Test_diff_with_cursorline_number_01.dump
@@ -0,0 +1,20 @@
+| +0#0000e05#a8a8a8255@1| +0#af5f00255#ffffff0@3|-+0#4040ff13#afffff255@30||+1#0000000#ffffff0| +0#0000e05#a8a8a8255@1| +0#af5f00255#ffffff0@1|1| |b+0#0000000#5fd7ff255|a|z| @27
+| +0#0000e05#a8a8a8255@1| +8#0000001#ffffff16@1|1| >f+8#ffffff16#ff404010|o@1| @27||+1#0000000#ffffff0| +0#0000e05#a8a8a8255@1| +8#0000001#ffffff16@1|2| |f+8#ffffff16#ff404010|o@1| @27
+| +0#0000e05#a8a8a8255@1| +0#af5f00255#ffffff0@1|2| |f+0#0000000&|o@1| @27||+1&&| +0#0000e05#a8a8a8255@1| +0#af5f00255#ffffff0@1|3| |f+0#0000000&|o@1| @27
+| +0#0000e05#a8a8a8255@1| +0#af5f00255#ffffff0@1|3| |b+0#0000000&|a|r| @27||+1&&| +0#0000e05#a8a8a8255@1| +0#af5f00255#ffffff0@1|4| |b+0#0000000&|a|r| @27
+|~+0#4040ff13&| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|[+3#0000000&|N|o| |N|a|m|e|]| |[|+|]| @5|1|,|1| @11|A|l@1| |[+1&&|N|o| |N|a|m|e|]| |[|+|]| @5|2|,|1| @11|A|l@1
+| +0&&@74
diff --git a/src/testdir/dumps/Test_diff_with_cursorline_number_02.dump b/src/testdir/dumps/Test_diff_with_cursorline_number_02.dump
new file mode 100644
index 000000000..028441c5e
--- /dev/null
+++ b/src/testdir/dumps/Test_diff_with_cursorline_number_02.dump
@@ -0,0 +1,20 @@
+| +0#0000e05#a8a8a8255@1| +0#af5f00255#ffffff0@3|-+0#4040ff13#afffff255@30||+1#0000000#ffffff0| +0#0000e05#a8a8a8255@1| +0#af5f00255#ffffff0@1|1| |b+0#0000000#5fd7ff255|a|z| @27
+| +0#0000e05#a8a8a8255@1| +8#0000001#ffffff16@1|1| >f+0#0000000#ffffff0|o@1| @27||+1&&| +0#0000e05#a8a8a8255@1| +8#0000001#ffffff16@1|2| |f+8#ffffff16#ff404010|o@1| @27
+| +0#0000e05#a8a8a8255@1| +0#af5f00255#ffffff0@1|2| |f+0#0000000&|o@1| @27||+1&&| +0#0000e05#a8a8a8255@1| +0#af5f00255#ffffff0@1|3| |f+0#0000000&|o@1| @27
+| +0#0000e05#a8a8a8255@1| +0#af5f00255#ffffff0@1|3| |b+0#0000000&|a|r| @27||+1&&| +0#0000e05#a8a8a8255@1| +0#af5f00255#ffffff0@1|4| |b+0#0000000&|a|r| @27
+|~+0#4040ff13&| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|~| @35||+1#0000000&|~+0#4040ff13&| @35
+|[+3#0000000&|N|o| |N|a|m|e|]| |[|+|]| @5|1|,|1| @11|A|l@1| |[+1&&|N|o| |N|a|m|e|]| |[|+|]| @5|2|,|1| @11|A|l@1
+|:+0&&|s|e|t| |c|u|r|s|o|r|l|i|n|e|o|p|t|=|n|u|m|b|e|r| @49
diff --git a/src/testdir/test_diffmode.vim b/src/testdir/test_diffmode.vim
index c626023b4..a632b19bc 100644
--- a/src/testdir/test_diffmode.vim
+++ b/src/testdir/test_diffmode.vim
@@ -1056,6 +1056,32 @@ func Test_diff_with_cursorline()
   call delete('Xtest_diff_cursorline')
 endfunc
 
+func Test_diff_with_cursorline_number()
+  CheckScreendump
+
+  let lines =<< trim END
+      hi CursorLine ctermbg=red ctermfg=white
+      hi CursorLineNr ctermbg=white ctermfg=black cterm=underline
+      set cursorline number
+      call setline(1, ["baz", "foo", "foo", "bar"])
+      2
+      vnew
+      call setline(1, ["foo", "foo", "bar"])
+      windo diffthis
+      1wincmd w
+  END
+  call writefile(lines, 'Xtest_diff_cursorline_number')
+  let buf = RunVimInTerminal('-S Xtest_diff_cursorline_number', {})
+
+  call VerifyScreenDump(buf, 'Test_diff_with_cursorline_number_01', {})
+  call term_sendkeys(buf, ":set cursorlineopt=number\r")
+  call VerifyScreenDump(buf, 'Test_diff_with_cursorline_number_02', {})
+
+  " clean up
+  call StopVimInTerminal(buf)
+  call delete('Xtest_diff_cursorline_number')
+endfunc
+
 func Test_diff_with_cursorline_breakindent()
   CheckScreendump
 
diff --git a/src/version.c b/src/version.c
index 800b8fc55..9753167ad 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4520,
+/**/
     4519,
 /**/
     4518,