[Bug 90264] [Regression, bisected] Tooltip corruption in Chrome

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90264

--- Comment #4 from falaca at gmail.com ---
When I set LIBGL_ALWAYS_SOFTWARE=1, chrome://gpu shows "Software only" for all
the features, and the GL_RENDERER string is "Gallium 0.4 on llvmpipe (LLVM 3.6,
128 bits)".

It does appear to be a bug somewhere in the Radeon-specific code, but based on
my tests above, it looks like the bug is triggered by the Mesa commit that I
bisected. The purpose of the commit (if I understand correctly) is to avoid
processing redundant viewport updates, so it seems like that causes the radeon
driver to display stale content.

This may or may not be related, but here is another interesting screenshot:
https://www.dropbox.com/s/9ydljofmj8kfxme/corruption_2.png?dl=0

That is my desktop, and you can see some white tiles surrounding the "Portal"
icon. Those tiles are showing content from another window (Android Studio)
which I had previously launched and then minimized. If you download the picture
and zoom in, you can see the little folder icons with the Android logo on them.
So that also seems like an issue of displaying stale content.

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