GNU bug report logs - #16967
frame related race condition

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: martin rudalics <rudalics <at> gmx.at>
Cc: Juanma Barranquero <lekktu <at> gmail.com>, 16967 <at> debbugs.gnu.org
Subject: bug#16967: frame related race condition
Date: Mon, 10 Mar 2014 21:33:55 -0400

> Lately I frequently noticed that an Emacs frame that was for some time
> hidden by other applications and subsequently became exposed by deleting
> their windows was not redrawn and I would like to know whether this was
> the reason.  ISTR that others noted the same or a similar misbehavior.

My "redisplay bit" changes of a few months back introduced such bugs.
I haven't seen such problems for a while now, so I think I've caught all
the problems, but maybe I still missed some.

Part of the change is that previously iconified/invisible frames where
redisplayed right away (i.e. their glyph matrices were kept up-to-date),
whereas now they're not.  Which means that when they're uniconified or
made visible, we have to first set windows_or_buffers_changed to
REDISPLAY_SOME, to make sure that the subsequent redisplay doesn't
forget to look at them.


        Stefan

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