Window focus signals #680

Job	Run time
linux	4m 45s
linux-per-backend	5m 19s
android-sdl	4m 50s
android-sfml-graphics	2m 15s
linux-latest-dev	2m 18s
linux-oldest	2m 52s
macos	1m 58s
windows	2m 16s
windows-clang	4m 24s
windows-oldest	5m 29s
windows-static-mt	4m 53s
ios-sdl	3m 10s
ios-sfml-graphics	52s
nightly-build-windows-visual-studio	0s
	45m 21s

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