614d6bd0f8
If the user Alt-Tabs out of the window, we will be left thinking the Alt key is still pressed since we don't see a release for it. Solve this and other related issues for the nested X11 compositor by selecting for KeymapStateMask which causes a KeymapNotify event to be sent after each FocusIn, and when we get these events, update the internal XKB state and send any necessary modifiers events to clients. https://bugzilla.gnome.org/show_bug.cgi?id=753948