Display updates strangely - extra text appears and then disappears

[asjo@koldfront.dk (Adam Sjøgren)]

After this commit ('git bisect' tells me):

  commit 8275687bb908174b84021ee15ecd959733cecb9d
  Author: Eli Zaretskii <eliz@gnu.org>
  Date:   Sat Mar 25 16:59:17 2017 +0300

      Fix a segfault due to failure to realize some faces

      * src/xdisp.c (redisplay_internal): If the frame becomes garbaged
      while redisplaying its windows, redisplay all of its windows
      again.  (Bug#26097)
      (init_iterator): When freeing all realized faces on all frames,
      reset the 'face_change' flag of the frame whose window we are
      about to iterate.

the *Group* buffer in Gnus has extra text where there should be none
when you quit a summer and return. After 0.5-1 seconds the extra text
disappears and the buffer looks normal again.

It also happens sometimes when switching to another virtual desktop and
then back to the desktop with Emacs on it.

Video of the effect:

 · https://koldfront.dk/misc/gnu-emacs/redisplay.ogg (8.7 MB)


  Best regards,

    Adam

-- 
 "Money always takes the place of life"                       Adam Sjøgren
                                                         asjo@koldfront.dk