[Bug 42426] Artifacts when firefox does partial image rendering [SNA]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=42426

--- Comment #55 from Jan Steffens <jan.steffens at gmail.com> ---
Thinkpad X220 (SNB), Linux 3.7.1, intel 2.20.17 (SNA), Firefox 19.0a2

Also seeing the corruption from screenshot #1. Happens while Firefox is loading
an image. Once the image is completely loaded, Firefox immediately repaints it
completely, without error.

I think this happens when Firefox paints multiple lines in a single cycle, in
which the first line painted is erroneously repeated for the rest of them. To
reproduce, maybe try loading an image over a slow network connection with a lot
of jitter.

The bug is visible independent of activated Firefox layer acceleration.

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