[Bug 72375] Corruption in some windows after returning from xlock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72375

--- Comment #17 from Ilia Mirkin <imirkin at alum.mit.edu> ---
I've confirmed that other parts of the window are also affected (e.g. the
play/pause/etc buttons).

Based on no knowledge of the hw or driver structure (aka feel free to ignore),
I'd guess this has something to do with either drawing to off-screen pixmaps or
saving of pixmaps when they go off-screen or reloading them. (e.g. what happens
if someone's drawing to a pixmap that's off-screen and then it gets shown,
while the drawing is happening, etc. Perhaps that's a super-common case that
you've thought of already though.) The only times I've seen this happen is if
the window is hidden by something (e.g. xlock, or another window), and then
becomes visible (e.g. as a result of a desktop switch).

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