instead of caching them in the Display::Box
Created attachment 403526 [details] Patch
m_positiveAndNegativeVerticalMargin and m_usedVerticalMargins will eventually be merged.
Committed r263943: <https://trac.webkit.org/changeset/263943> All reviewed patches have been landed. Closing bug and clearing flags on attachment 403526 [details].
<rdar://problem/65098386>