diff options
Diffstat (limited to 'src/xdisp.c')
| -rw-r--r-- | src/xdisp.c | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/src/xdisp.c b/src/xdisp.c index 90977aa3d7d..9c8f7b6a814 100644 --- a/src/xdisp.c +++ b/src/xdisp.c @@ -12777,6 +12777,8 @@ redisplay_window (window, just_this_one_p) int rc; int centering_position = -1; int last_line_misfit = 0; + int save_beg_unchanged = BEG_UNCHANGED; + int save_end_unchanged = END_UNCHANGED; SET_TEXT_POS (lpoint, PT, PT_BYTE); opoint = lpoint; @@ -13145,11 +13147,20 @@ redisplay_window (window, just_this_one_p) && NILP (do_mouse_tracking) && CHARPOS (startp) > BEGV) { - /* Make sure beg_unchanged and end_unchanged are up to date. - Do it only if buffer has really changed. This may or may - not have been done by try_window_id (see which) already. */ +#if 0 + /* The following code tried to make BEG_UNCHANGED and + END_UNCHANGED up to date (similar to try_window_id). + Is it important to do so? + + The trouble is that it's a little too strict when it + comes to overlays: modify_overlay can call + BUF_COMPUTE_UNCHANGED, which alters BUF_BEG_UNCHANGED and + BUF_END_UNCHANGED directly without moving the gap. + + This can result in spurious recentering when overlays are + altered in the buffer. So unless it's proven necessary, + let's leave this commented out for now. -- cyd. */ if (MODIFF > SAVE_MODIFF - /* This seems to happen sometimes after saving a buffer. */ || BEG_UNCHANGED + END_UNCHANGED > Z_BYTE) { if (GPT - BEG < BEG_UNCHANGED) @@ -13157,9 +13168,10 @@ redisplay_window (window, just_this_one_p) if (Z - GPT < END_UNCHANGED) END_UNCHANGED = Z - GPT; } +#endif - if (CHARPOS (startp) > BEG + BEG_UNCHANGED - && CHARPOS (startp) <= Z - END_UNCHANGED) + if (CHARPOS (startp) > BEG + save_beg_unchanged + && CHARPOS (startp) <= Z - save_end_unchanged) { /* There doesn't seems to be a simple way to find a new window start that is near the old window start, so |