Ensure window-start and window-hscroll remain unchanged #16

Job	Run time
test (ubuntu-latest, 27.2, false)	35s
test (ubuntu-latest, 28.2, false)	35s
test (ubuntu-latest, 29.4, false)	46s
test (macos-latest, 28.2, false)	1m 27s
test (macos-latest, 29.4, false)	1m 32s
test (windows-latest, 27.2, false)	1m 10s
test (windows-latest, 28.2, false)	1m 5s
test (windows-latest, 29.4, false)	1m 9s
test (ubuntu-latest, snapshot, true)	34s
test (macos-latest, snapshot, true)	1m 12s
test (windows-latest, snapshot, true)	1m 15s
	11m 20s

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