display: Ensure that we ignore our own focus events for focus predictions
When we set the input focus, we first set the predicted window, and then try to process focus events. But as XI_FocusOut on the existing window comes before XI_FocusIn on the new window, we'll see the focus out on the old window and think the focus is going to nothing, which makes mutter think the prediction failed. This didn't really matter as nothing paid attention to the focus window changing, but with gnome-shell's focus rework, we'll try and drop keyboard focus in events like these. Fix this by making sure that we ignore focus window changes of our own cause when updating the focus window field, by ignoring all focus events that have a serial the same as the focus request or lower. Note that if mutter doens't make any requests after the focus request, this could be racy, as another client could steal the focus, but mutter would ignore it as the serial was the same. Bump the serial by making a dummy ChangeProperty request to a mutter-controlled window in this case. https://bugzilla.gnome.org/show_bug.cgi?id=701017
parent
2a5b0688
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mentioned in commit metacity@66a4cb4a
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mentioned in commit metacity@b96341da
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