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Fix an infloop during cursor movement

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* src/xdisp.c (move_it_vertically_backward): Prevent infloop due
to overlays with embedded newlines at BOB.  (Bug#81567)
This commit is contained in:
Eli Zaretskii 2026-08-15 16:46:05 +03:00
parent e435a8e869
commit 165152e7cd
1 changed files with 9 additions and 1 deletions
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10
src/xdisp.c
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@ -11298,10 +11298,18 @@ move_it_vertically_backward (struct it *it, int dy)
y-distance. */
SAVE_IT (it2, *it, it2data);
it2.max_ascent = it2.max_descent = 0;
ptrdiff_t to_pos = start_pos;
do
{
/* Avoid inflooping of there's a large display string with several
embedded newlines, which makes move_it_to stop after START_POS
but still inside a display or overlay string. */
if (IT_CHARPOS (it2) >= start_pos)
to_pos = -1;
move_it_to (&it2, start_pos, -1, -1, it2.vpos + 1,
MOVE_TO_POS | MOVE_TO_VPOS);
(to_pos > 0
? (MOVE_TO_POS | MOVE_TO_VPOS)
: MOVE_TO_VPOS));
}
while (!(IT_POS_VALID_AFTER_MOVE_P (&it2)
/* If we are in a display string which starts at START_POS,