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patch 9.1.0083: Redrawing can be improved when deleting lines with 'number'

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Problem:  Redrawing can be improved when inserting/deleting lines with 'number'.
Solution: Only redraw the number column of lines below changed lines.
          Add a test as this wasn't previously tested.
          (zeertzjq)

closes: #13985

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
zeertzjq
2024-02-08 11:37:40 +01:00
committed by Christian Brabandt
parent 7ce34c9a94
commit ae07ebc04b
6 changed files with 62 additions and 13 deletions
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16
src/drawscreen.c
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@@ -1699,11 +1699,6 @@ win_update(win_T *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;
@@ -2540,11 +2535,16 @@ win_update(win_T *wp)
}
else
{
if (wp->w_p_rnu && wp->w_last_cursor_lnum_rnu != wp->w_cursor.lnum)
// If:
// - 'number' is set and below inserted/deleted lines, or
// - 'relativenumber' is set and cursor moved vertically,
// the text doesn't need to be redrawn, but the number column does.
if ((wp->w_p_nu && mod_top != 0
&& lnum >= mod_bot && buf->b_mod_xlines != 0)
|| (wp->w_p_rnu
&& wp->w_last_cursor_lnum_rnu != wp->w_cursor.lnum))
{
#ifdef FEAT_FOLDING
// 'relativenumber' set and the cursor moved vertically: The
// text doesn't need to be drawn, but the number column does.
fold_count = foldedCount(wp, lnum, &win_foldinfo);
if (fold_count != 0)
fold_line(wp, fold_count, &win_foldinfo, lnum, row);