see hasOutOfFlowPosition() vs. inFlow() on RenderLineBreak.
Created attachment 465485 [details] Patch
Committed 261859@main (1bcce795a28b): <https://commits.webkit.org/261859@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 465485 [details].
<rdar://problem/106928366>
*** Bug 199168 has been marked as a duplicate of this bug. ***