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Philip authored
* src/xdisp.c (forget_escape_and_glyphless_faces): New function. (display_echo_area_1, redisplay_internal): Call it to avoid reusing stale face IDs for 'escape-glyph' and 'glyphless-char' faces, which could case a segfault if the frame's face cache was freed since the last redisplay. (Bug#21394) * src/xfaces.c (free_realized_faces): Call forget_escape_and_glyphless_faces. * src/dispextern.h (forget_escape_and_glyphless_faces): Add prototype. Copyright-paperwork-exempt: yes
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