Ensure window-start and window-hscroll remain unchanged #17

Job	Run time
test (ubuntu-latest, 27.2, false)	41s
test (ubuntu-latest, 28.2, false)	39s
test (ubuntu-latest, 29.4, false)	48s
test (macos-latest, 28.2, false)	1m 32s
test (macos-latest, 29.4, false)	1m 43s
test (windows-latest, 27.2, false)	1m 21s
test (windows-latest, 28.2, false)	1m 14s
test (windows-latest, 29.4, false)	1m 12s
test (ubuntu-latest, snapshot, true)	37s
test (macos-latest, snapshot, true)	1m 18s
test (windows-latest, snapshot, true)	1m 13s
	12m 18s

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