bug#18162: 24.3.92; segfault on null face pointer in face_for_char

[Ken Raeburn <raeburn@permabit.com>]

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On Fri, Aug 1, 2014 at 1:57 AM, Eli Zaretskii <eliz@gnu.org> wrote:

> Sounds like some code called clear_face_cache, for some reason.  Is f
> at all the same frame where you were typing?  If not, the crash could
> have nothing to do with what you typed, but with some background
> activity on another frame.
>

I just ran Emacs a while under gdb, and it called clear_face_cache while I
wasn't doing anything interesting, just typing into a buffer. It happened
from in redisplay_internal when clear_face_cache_count reached 501. Its
documentation says it's used to "clear the face cache every once in a
while".

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