[debbugs-tracker] bug#28589: closed (27.0.50; Emacs screen often becomes blank)

[GNU bug Tracking System]

Your message dated Tue, 26 Sep 2017 18:31:37 +0000
with message-id <address@hidden>
and subject line Re: bug#28589: 27.0.50; Emacs screen often becomes blank
has caused the debbugs.gnu.org bug report #28589,
regarding 27.0.50; Emacs screen often becomes blank
to be marked as done.

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28589: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=28589
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> --- Begin Message ---
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> Subject: 
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> 27.0.50; Emacs screen often becomes blank
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> Date: 
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> Mon, 25 Sep 2017 10:01:30 +0900
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> User-agent: 
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> Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (i686-pc-cygwin)
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>
>
> Hi,
>
> 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.
>
> Thanks.
>
> In GNU Emacs 27.0.50 (build 1, i686-pc-cygwin, GTK+ Version 3.18.9)
>  of 2017-09-25 built on localhost
> Windowing system distributor 'The Cygwin/X Project', version 11.0.11900000
>
>
>
> --- End Message ---

--- Begin Message --- Subject: Re: bug#28589: 27.0.50; Emacs screen often becomes blank Date: Tue, 26 Sep 2017 18:31:37 +0000

Katsumi Yamaoka <address@hidden> schrieb am Di., 26. Sep. 2017 um 06:44 Uhr:

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.

[1]
Don't attempt to disable double buffering in newer GTK+ versions
<http://lists.gnu.org/archive/html/emacs-diffs/2017-09/msg00293.html>

Sigh, I had almost expected this would happen. Reverted with 2fa19cc551. But now we have another time bomb in the codebase: the gtk_widget_set_double_buffered function is deprecated and will probably be removed sometime. This makes the migration to a pure GTK+ build even more pressing.

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