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The Cogl rework removed the Window creation from realize and its relative destruction from unrealize; the two vfuncs also managed the mapping between Window and Stage implementation that we use when dealing with event handling. Sadly, the missing unrealization left entries in the mapping dangling. Since ClutterStageX11 already provides a ::realize implementation that sub-classes are supposed to chain up to, and the Window ↔ Stage mapping is private to clutter-stage-x11.c, it seems only fair that the ClutterStageX11 should also provide an ::unrealize implementation matching the ::realize. This implementation just removes the StageX11 pointer from the X11 Window ↔ ClutterStageX11 mapping we set up in ::realize, since the X11 Window is managed by Cogl, now.