Implement highlight a duration when preview line changed #47

Job	Run time
test (ubuntu-latest, 26.3, false)	33s
test (ubuntu-latest, 27.2, false)	26s
test (ubuntu-latest, 28.2, false)	39s
test (ubuntu-latest, 29.2, false)	43s
test (macos-latest, 26.3, false)	1m 44s
test (macos-latest, 27.2, false)	2m 34s
test (macos-latest, 28.2, false)	1m 49s
test (macos-latest, 29.2, false)	2m 11s
test (windows-latest, 26.3, false)	2m 31s
test (windows-latest, 27.2, false)	1m 5s
test (windows-latest, 28.2, false)	47s
test (windows-latest, 29.2, false)	42s
test (ubuntu-latest, snapshot, true)	29s
test (macos-latest, snapshot, true)	2m 42s
test (windows-latest, snapshot, true)	40s
	19m 35s

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