[Wayland-bugs] [Bug 775093] Missing (partial) window redraw when returning to a window on a different workspace (gnome-shell)

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775093

--- Comment #3 from Benjamin Berg <benjamin at sipsolutions.net> ---
So, I have learned that removing gdk_window_process_updates in VTE almost
solves this bug (but not entirely!).

Patrick was hitting it a lot in newer gnome-shell versions (with
maximize/unmaximize animation). Removing the call to gdk_window_process_udpates
fixes it in most cases, but the bug can still be triggered when
maximizing/unmaximizing quickly in a row.

So it seems like:
 * Triggering might require a committed frame to be pending
 * It can be triggered by updates happening outside of the frame clock
   (which doesn't necessarily mean a frame is pending, just that we render
   multiple times into the staging frame)
 * It *might* be related to back-filling from an already committed buffer
   (i.e. back-filling areas that were actually updated)
 * Further partial updates will *not* cause the area to appear
 * mutter will get multiple attach + damage rectangles
   (attach for the same surface, damage needs to be aggregated)

Unfortunately, I have read over the back-filling code and I cannot think of any
corner case where it goes wrong. I am not that sure about the mutter side
though.

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