Ensure window-start and window-hscroll remain unchanged #12

Job	Run time
test (ubuntu-latest, 27.2, false)	36s
test (ubuntu-latest, 28.2, false)	35s
test (ubuntu-latest, 29.4, false)	48s
test (macos-latest, 28.2, false)	1m 20s
test (macos-latest, 29.4, false)	1m 30s
test (windows-latest, 27.2, false)	1m 17s
test (windows-latest, 28.2, false)	1m 11s
test (windows-latest, 29.4, false)	1m 24s
test (ubuntu-latest, snapshot, true)	32s
test (macos-latest, snapshot, true)	1m 21s
test (windows-latest, snapshot, true)	2m 8s
	12m 42s

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