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Avoid assertion violation in intervals.c

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* src/intervals.c (delete_interval): Allow negative values of
LENGTH (i).  This happens when delete_interval is called from
set_intervals_multibyte_1, because the caller zeroes out the
total_length field of the interval to be deleted.  See
https://lists.gnu.org/archive/html/emacs-devel/2020-04/msg00131.html
for more details.  See also a related old discussion at
https://lists.gnu.org/archive/html/emacs-devel/2012-07/msg00399.html.
This commit is contained in:
Eli Zaretskii 2020-04-09 11:21:18 +03:00
parent 18d1bc0a09
commit d5750af151
1 changed files with 1 additions and 1 deletions
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2
src/intervals.c
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@ -1187,7 +1187,7 @@ delete_interval (register INTERVAL i)
register INTERVAL parent;
ptrdiff_t amt = LENGTH (i);
eassert (amt == 0); /* Only used on zero-length intervals now. */
eassert (amt <= 0); /* Only used on zero total-length intervals now. */
if (ROOT_INTERVAL_P (i))
{