feat: add line count to folded text overlay #598

Job	Run time
test (ubuntu-latest, 27.2, false)	42s
test (ubuntu-latest, 28.2, false)	43s
test (ubuntu-latest, 29.4, false)	1m 15s
test (macos-latest, 28.2, false)	1m 34s
test (macos-latest, 29.4, false)	2m 7s
test (windows-latest, 27.2, false)	1m 44s
test (windows-latest, 28.2, false)	1m 20s
test (windows-latest, 29.4, false)	3m 31s
test (ubuntu-latest, snapshot, true)	35s
test (macos-latest, snapshot, true)	1m 38s
test (windows-latest, snapshot, true)	1m 57s
	17m 6s

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