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bug#28589: 27.0.50; Emacs screen often becomes blank

From: Katsumi Yamaoka
Subject: bug#28589: 27.0.50; Emacs screen often becomes blank
Date: Tue, 26 Sep 2017 13:43:15 +0900
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (i686-pc-cygwin)

On Mon, 25 Sep 2017 10:01:30 +0900, Katsumi Yamaoka wrote:
> Emacs screen often becomes blank or blinks.  This didn't happen
> the last weekend, doesn't happen sometimes but often happens.
> Changing the window configuration --- scrolling a window, showing
> a message of two or more lines in the echo area, etc. --- seems
> to cause it.  More funny thing is, when two Emacsen are running,
> the one of which the frame is not selected becomes blank.
> Typing any key in the selected blank frame will help, as if
> (sit-for ∞) is running.

Reverting the change c0af83b[1] solves this problem.

Don't attempt to disable double buffering in newer GTK+ versions

> Thanks.

In GNU Emacs 27.0.50 (build 4, i686-pc-cygwin, GTK+ Version 3.18.9)
 of 2017-09-26 built on localhost
Windowing system distributor 'The Cygwin/X Project', version 11.0.11900000

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