Account for large values of scroll-margin in evil-window-top+bottom #408

Job	Run time
build (ubuntu-latest, 26.3, false)	32s
build (ubuntu-latest, 27.2, false)	37s
build (ubuntu-latest, 28.2, false)	43s
build (ubuntu-latest, 29.3, false)	1m 43s
build (macos-latest, 28.2, false)	2m 58s
build (macos-latest, 29.3, false)	4m 44s
build (windows-latest, 26.3, false)	8m 36s
build (windows-latest, 27.2, false)	8m 36s
build (windows-latest, 28.2, false)	2m 10s
build (windows-latest, 29.3, false)	8m 32s
build (ubuntu-latest, snapshot, true)	38s
build (macos-latest, snapshot, true)	2m 31s
	42m 20s

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