Unit tests for main window actions #509

Job	Run time
publish-on-pypi	2m 2s
build-installer-on-windows / build	18m 51s
build-on-macos / build	25m 13s
build-on-ubuntu / build	4m 20s
build-on-windows / build	18m 37s
publish-on-github	54s
	1h 9m 57s

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