From: Dmitry Gutov <dgutov@yandex.ru>
To: 16621@debbugs.gnu.org
Subject: bug#16621: 24.3.50; Periodic timer + overlays = flickering near point
Date: Sun, 02 Feb 2014 03:01:26 +0200 [thread overview]
Message-ID: <87r47m72ft.fsf@yandex.ru> (raw)
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It happens with different overlays, and with the default monospaced font
of my system (Ubuntu GNU/Linux), but it's easiest to reproduce doing
isearch, and using Fira Mono (TrueType version, available from
https://www.mozilla.org/en-US/styleguide/products/firefox-os/typeface/,
see the bottom of the page). Steps from emacs -Q:
1. Evaluate (run-at-time nil 0.01 'ignore)
2. Evaluate (set-face-attribute 'default nil :height 105 :family "Fira Mono")
This is optional, but with the default font the flickering is harder to
reproduce.
3. Open a text file press C-s (or C-r), enter some letters, preferably
common to that file, press C-s or C-r again. Repeat multiple times.
Maybe do that for a couple of minutes, even.
4. Observe flickering letters, usually one to the left, or one to the
right of the cursor.
Most of the time the flickering happens 2 or 3 times and stops, but I've
managed to record a couple of semi-stable loops of this on video, see
the attachment. It demonstrates a somewhat extreme situation, usually I
only see flickering once every handful searches or so.
This is in no way limited to isearch. For example, I can also see it
when typing, when using the fancy highlight-tail-mode
(http://www.emacswiki.org/emacs-en/highlight-tail.el), at least with
settings highlight-tail-steps 14, highlight-tail-timer 0.02.
Let me know if the video format (h264) is not acceptable.
In GNU Emacs 24.3.50.5 (x86_64-unknown-linux-gnu, GTK+ Version 3.8.6)
of 2014-02-01 on axl
Repository revision: 116234 dgutov@yandex.ru-20140201170608-2rn2phrkukqt84gm
Windowing system distributor `The X.Org Foundation', version 11.0.11405000
System Description: Ubuntu 13.10
[-- Attachment #2: screencast --]
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next reply other threads:[~2014-02-02 1:01 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-02 1:01 Dmitry Gutov [this message]
2014-02-02 2:33 ` bug#16621: 24.3.50; Periodic timer + overlays = flickering near point Stefan Monnier
2014-02-02 2:37 ` Dmitry Gutov
2014-02-02 16:39 ` Eli Zaretskii
2014-02-03 2:12 ` Stefan Monnier
2014-02-03 5:47 ` Eli Zaretskii
2014-02-03 13:41 ` Stefan Monnier
2014-02-03 16:14 ` Eli Zaretskii
2014-02-04 3:28 ` Stefan Monnier
2014-02-04 3:44 ` Eli Zaretskii
2014-02-04 2:34 ` Dmitry Gutov
2014-02-04 3:48 ` Eli Zaretskii
2014-02-04 6:17 ` Dmitry Gutov
2014-02-04 16:00 ` Eli Zaretskii
2014-02-04 22:08 ` Jan D.
2014-02-05 3:57 ` Eli Zaretskii
2014-02-05 6:02 ` Jan Djärv
2014-02-05 15:40 ` Eli Zaretskii
2014-02-05 13:46 ` Stefan Monnier
2014-02-05 15:59 ` Eli Zaretskii
2014-02-05 18:57 ` Stefan Monnier
2014-02-05 20:00 ` Eli Zaretskii
2014-02-05 21:46 ` Stefan Monnier
2014-02-06 5:56 ` Eli Zaretskii
2014-02-06 13:08 ` Stefan Monnier
2014-02-06 14:20 ` Eli Zaretskii
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