bug#15844: 24.3.50; Segfault in redisplay_internal

[Nathan Trapuzzano]

Eli Zaretskii <eliz@gnu.org> writes:

> Did you mean "C-h f"?

Yes.

> Please try to figure out how come FACE_FROM_ID returns NULL when the
> face ID is 24.  (Is it always 24 when this happens?)

It's been 24 every time I've looked, which appears to be the "fringe"
face.  The reason NULL is returned is frame->face_cache->used is 23.