fcc7501eb8
This layer isn't really being used and in fact, it causes meta_stack_get_default_focus_window() to return a fullscreen window even if the naturally topmost window in the stack isn't a fullscreen one. Note that commit a3bf9b01aa7019798924b618160fcb184e096a3c changed how we choose the default focus window from the MRU to the topmost in the stack. https://bugzilla.gnome.org/show_bug.cgi?id=768221