Account for large values of scroll-margin in evil-window-top+bottom #775

Job	Run time
build (ubuntu-latest, 26.3, false)	32s
build (ubuntu-latest, 27.2, false)	34s
build (ubuntu-latest, 28.2, false)	39s
build (ubuntu-latest, 29.3, false)	1m 34s
build (macos-latest, 28.2, false)	2m 26s
build (macos-latest, 29.3, false)	4m 15s
build (windows-latest, 26.3, false)	4m 22s
build (windows-latest, 27.2, false)	7m 15s
build (windows-latest, 28.2, false)	6m 37s
build (windows-latest, 29.3, false)	8m 19s
build (ubuntu-latest, snapshot, true)	37s
build (macos-latest, snapshot, true)	2m 30s
	39m 40s

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