Intent of lineHeights.test|title=Editor ViewLayout - LineHeightsManager (auto-commit on read) multiple onLinesInserted without reads between|occurrence=1, lineHeights.test|title=Editor ViewLayout - LineHeightsManager (auto-commit on read) pending insert then onLinesInserted shifting that line|occurrence=1

All 6 exact tests in this concept. Every test is marked by where it enters the hierarchy.