Fix full screen window restore / multi-screen / misc issues #811

Job	Run time
build-and-test (macos-13, 15.2, vimtags, check-xcodeproj-compat)	36m 42s
build-and-test (macos-14, 15.4, true)	35m 17s
build-and-test (macos-15, 16.2, true, true)	40m 56s
	1h 52m 55s

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