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Avoid assertion violation under visual-order-cursor-movement

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* src/xdisp.c (Fmove_point_visually): Don't let point exceed the
BEGV..ZV range.  Signal Beginning of buffer error when there's a
before-string at BEGV.  (Bug#30787)
This commit is contained in:
Eli Zaretskii 2018-03-13 18:00:23 +02:00
parent e4b73abd38
commit 3e39897cd0
1 changed files with 5 additions and 0 deletions
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5
src/xdisp.c
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@ -22430,6 +22430,11 @@ Value is the new character position of point. */)
new_pos += (row->reversed_p ? -dir : dir);
else
new_pos -= (row->reversed_p ? -dir : dir);
new_pos = clip_to_bounds (BEGV, new_pos, ZV);
/* If we didn't move, we've hit BEGV or ZV, so we
need to signal a suitable error. */
if (new_pos == PT)
break;
}
else if (BUFFERP (g->object))
new_pos = g->charpos;