feat: add line count to folded text overlay #594

Job	Run time
test (ubuntu-latest, 27.2, false)	40s
test (ubuntu-latest, 28.2, false)	41s
test (ubuntu-latest, 29.4, false)	1m 12s
test (macos-latest, 28.2, false)	1m 42s
test (macos-latest, 29.4, false)	2m 39s
test (windows-latest, 27.2, false)	1m 29s
test (windows-latest, 28.2, false)	1m 15s
test (windows-latest, 29.4, false)	3m 55s
test (ubuntu-latest, snapshot, true)	35s
test (macos-latest, snapshot, true)	1m 20s
test (windows-latest, snapshot, true)	4m 46s
	20m 14s

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