Merge #3878 Restore window position without default instance #1251

Job	Run time
build_NetCore (Debug_NetCore)	1m 9s
build_NetCore (Release_NetCore)	53s
build (6.8, Debug)	1m 22s
build (6.8, Release)	2m 29s
build (6.10, Debug)	1m 22s
build (6.10, Release)	1m 19s
build (6.12, Debug)	1m 28s
build (6.12, Release)	1m 26s
build (latest, Debug)	1m 54s
build (latest, Release)	1m 55s
	15m 17s

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