Fix Linux window cleanup #1126

Job	Run time
Linux -> Pre-checks	16s
Linux -> GCC-x64, Release	9m 11s
Linux -> GCC-x64, Debug	9m 36s
Linux -> Clang-ASAN-x64, RelWithDebInfo	13m 47s
Linux -> Clang-x64, Debug	10m 9s
Linux -> Clang-x64, Release	11m 37s
	54m 36s

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