We should disconnect line layout iterator cleanly when layout changes.
rdar://83690985
Created attachment 439709 [details] Patch
Created attachment 439711 [details] Patch
Created attachment 439713 [details] Patch
Created attachment 439722 [details] Patch
Committed r283311 (242336@main): <https://commits.webkit.org/242336@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 439722 [details].