Fix pixel-scroll-precision-mode when point is on a blank line #733

Job	Run time
build (ubuntu-latest, 26.3, false)	31s
build (ubuntu-latest, 27.2, false)	37s
build (ubuntu-latest, 28.2, false)	32s
build (ubuntu-latest, 29.3, false)	1m 3s
build (macos-latest, 28.2, false)	2m 1s
build (macos-latest, 29.3, false)	2m 16s
build (windows-latest, 26.3, false)	1m 57s
build (windows-latest, 27.2, false)	2m 13s
build (windows-latest, 28.2, false)	1m 51s
build (windows-latest, 29.3, false)	1m 19s
build (ubuntu-latest, snapshot, true)	42s
build (macos-latest, snapshot, true)	1m 59s
	17m 1s

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