GNU bug report logs - #1867
Resizing window causes text flickering when using antialiased font on X

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From: Jan Djärv <jan.h.d <at> swipnet.se>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: rgm <at> gnu.org, 1867 <at> debbugs.gnu.org, lbsmtp <at> gmail.com
Subject: bug#1867: Resizing window causes text flickering when using antialiased font on X
Date: Wed, 05 Oct 2011 19:34:45 +0200

Eli Zaretskii skrev 2011-10-05 12:41:
>> Date: Wed, 05 Oct 2011 09:01:28 +0200
>> From: "Jan D."<jan.h.d <at> swipnet.se>
>> Cc: Bo Lin<lbsmtp <at> gmail.com>, 1867 <at> debbugs.gnu.org
>>
>> FWIW, I can't see any text flicker in the scenario above.  However, the
>> hollow cursor in the non-selected windows do flicker which indicates
>> that there is some redrawing going on.
>
> The way redisplay is written, _any_ change to dimensions of _any_
> window sets a flag that will cause a thorough redisplay of all the
> windows on all the visible frames.  However, I'd expect that redisplay
> of any window not affected by the resizing be limited to redrawing the
> cursor.
>
> So even when antialiased fonts are used, I wouldn't expect any
> flickering, because Emacs should notice that the window didn't change
> at all.  Unless, that is, redrawing the cursor on X involves redrawing
> parts of the window text.  Does it?

Yes, but just the character under the cursor.

	Jan D.

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