Fix pixel-scroll-precision-mode when point is on a blank line #731

Job	Run time
build (ubuntu-latest, 26.3, false)	34s
build (ubuntu-latest, 27.2, false)	32s
build (ubuntu-latest, 28.2, false)	35s
build (ubuntu-latest, 29.3, false)	49s
build (macos-latest, 28.2, false)	1m 55s
build (macos-latest, 29.3, false)	2m 27s
build (windows-latest, 26.3, false)	1m 48s
build (windows-latest, 27.2, false)	55s
build (windows-latest, 28.2, false)	45s
build (windows-latest, 29.3, false)	46s
build (ubuntu-latest, snapshot, true)	37s
build (macos-latest, snapshot, true)	1m 54s
	13m 37s

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