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Fix structure viewer rendering on macOS and add basic GUI tests based on screenshot comparison #202

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Run time

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Job	Run time
build-installer (Ubuntu-20.04)	1m 57s
build-installer (Ubuntu-22.04)	2m 0s
build-installer (macOS-13)	2m 20s
build-installer (Windows-2022)	3m 44s
test-installer	1s
	10m 2s