bug#18757: 24.4; Intermittent screen flicker since upgrading to OS X 10.10

[Eli Zaretskii]

> From: Emanuel Evans <emanuel.evans@gmail.com>
> Date: Fri, 17 Oct 2014 16:33:26 -0700
> 
> Emanuel Evans <emanuel.evans@gmail.com> writes:
> 
> > Since upgrading to OS X 10.10 (Yosemite), I have been been experiencing
> > intermittent screen flickering problems with Cocoa Emacs 24.4
> > pre-test/RC1 (the issue did not occur in OS X 10.9 to my knowledge). In
> > general, the screen flickers in the top middle portion when switching
> > between windows or when switching buffers in a window (a video of the
> > issue can be found at
> > https://www.dropbox.com/s/9orcw95yru4p7jy/emacs-bug.mov?dl=0 ). I was
> > able to reproduce using emacs -Q in a cocoa window; I don't have exact
> > reproduction steps, since the bug seems quite non-deterministic, but
> > with a combination of screen splitting, switching to full screen
> > (although it is visible in non-full-screen mode as well), filling a
> > buffer with text (to make the flicker more visible), and switching
> > windows, the flicker becomes apparent.
> >
> 
> Quick follow-up: this bug does *not* appear in Emacs 24.3 on OS X 10.10.

Once the flicker starts, does it stop on its own, or does it continue
indefinitely?