feat: add line count to folded text overlay #596

Job	Run time
test (ubuntu-latest, 27.2, false)	41s
test (ubuntu-latest, 28.2, false)	39s
test (ubuntu-latest, 29.4, false)	1m 14s
test (macos-latest, 28.2, false)	1m 38s
test (macos-latest, 29.4, false)	1m 51s
test (windows-latest, 27.2, false)	2m 10s
test (windows-latest, 28.2, false)	1m 32s
test (windows-latest, 29.4, false)	3m 36s
test (ubuntu-latest, snapshot, true)	35s
test (macos-latest, snapshot, true)	1m 22s
test (windows-latest, snapshot, true)	3m 29s
	18m 47s

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