Refactor find-file advices #288

Job	Run time
test (ubuntu-latest, 28.2, false)	48s
test (ubuntu-latest, 29.3, false)	51s
test (macos-latest, 28.2, false)	1m 18s
test (macos-latest, 29.3, false)	1m 30s
test (windows-latest, 28.2, false)	50s
test (windows-latest, 29.3, false)	49s
test (ubuntu-latest, 26.3, false)	46s
test (macos-11, 26.3, false)	1m 58s
test (windows-latest, 26.3, false)	1m 49s
test (ubuntu-latest, 27.2, false)	47s
test (macos-11, 27.2, false)	2m 20s
test (windows-latest, 27.2, false)	58s
test (ubuntu-latest, snapshot, true)	40s
test (macos-latest, snapshot, true)	1m 25s
	16m 49s

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