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patch 9.1.0082: Redrawing can be improved when deleting lines with 'cursorline'

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Problem:  Redrawing can be improved when deleting lines with 'cursorline'.
Solution: Use smarter invalidation and adjustment.  Remove unnecessary
          UPD_VALID as it is already set at the top of the loop.  Make
          the test for #4862 fail without the fix.
          (zeertzjq)

closes: #13986

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
zeertzjq
2024-02-08 11:34:55 +01:00
committed by Christian Brabandt
parent b8170143c8
commit 7ce34c9a94
3 changed files with 21 additions and 20 deletions
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22
src/change.c
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@@ -656,22 +656,20 @@ changed_common(
set_topline(wp, wp->w_topline);
#endif
// If lines have been added or removed, relative numbering always
// requires a redraw.
// requires an update even if cursor didn't move.
if (wp->w_p_rnu && xtra != 0)
{
wp->w_last_cursor_lnum_rnu = 0;
redraw_win_later(wp, UPD_VALID);
}
#ifdef FEAT_SYN_HL
// Cursor line highlighting probably need to be updated with
// "UPD_VALID" if it's below the change.
// If the cursor line is inside the change we need to redraw more.
if (wp->w_p_cul)
if (wp->w_p_cul && wp->w_last_cursorline >= lnum)
{
if (xtra == 0)
redraw_win_later(wp, UPD_VALID);
else if (lnum <= wp->w_last_cursorline)
redraw_win_later(wp, UPD_SOME_VALID);
if (wp->w_last_cursorline < lnume)
// If 'cursorline' was inside the change, it has already
// been invalidated in w_lines[] by the loop above.
wp->w_last_cursorline = 0;
else
// If 'cursorline' was below the change, adjust its lnum.
wp->w_last_cursorline += xtra;
}
#endif
}