Ignore SDL events that were generated on another window #765

Job	Run time
android-sdl	6m 47s
android-sfml-graphics	2m 44s
ios-sdl	3m 28s
ios-sfml-graphics	1m 22s
linux	5m 21s
linux-latest-dev	5m 10s
linux-oldest	3m 37s
linux-per-backend	5m 30s
macos	3m 14s
windows	3m 20s
windows-clang	7m 40s
windows-oldest	2m 9s
windows-static-mt	5m 58s
nightly-build-windows-visual-studio	0s
	56m 20s

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