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Prevent redisplay slowdown with non-zero vscroll

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* src/xdisp.c (try_scrolling): Don't loop when the
partially-visible cursor line is at the top of the window.  This
looping are pointless, and just makes redisplay slow for no reason.
(Bug#78766)
This commit is contained in:
Eli Zaretskii 2025-06-17 16:00:04 +03:00
parent f38e969e47
commit 06b74b04cb
1 changed files with 5 additions and 3 deletions
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8
src/xdisp.c
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@ -19449,9 +19449,11 @@ try_scrolling (Lisp_Object window, bool just_this_one_p,
if (! cursor_row_fully_visible_p (w, extra_scroll_margin_lines <= 1,
false, false)
/* It's possible that the cursor is on the first line of the
buffer, which is partially obscured due to a vscroll
(Bug#7537). In that case, avoid looping forever. */
&& extra_scroll_margin_lines < w->desired_matrix->nrows - 1)
buffer/window, which is partially obscured due to a vscroll
(Bug#7537, Bug#78766). If so, just return, since the code
above is not prepared to deal with that case. */
&& !(MATRIX_ROW_PARTIALLY_VISIBLE_AT_TOP_P
(w, MATRIX_ROW (w->desired_matrix, w->cursor.vpos))))
{
clear_glyph_matrix (w->desired_matrix);
++extra_scroll_margin_lines;