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Putting X windows and pointers to MetaWindows into a union had a number of problems: - It caused awkward initialization and conditionalization - There was no way to refer to Wayland windows (represented by MetaWindow *) in the past, which is necessary for the MetaStackTracker algorithms - We never even cleaned up old MetaStackWindow so there could be records in MetaStackWindow pointing to freed MetaWindow. Replace MetaStackWindow with a 64-bit "stack ID" which is: - The XID for X Windows - a "window stamp" for Wayland windows - window stamps are assigned for all MetaWindow and are unique across the life of the process. https://bugzilla.gnome.org/show_bug.cgi?id=736559