Make it possible to adjust the final trait collection applied by LocalCurrentTraitCollection
Created attachment 457674 [details] Patch
<rdar://problem/87115393>
Created attachment 457675 [details] Patch
Committed r292914 (249684@main): <https://commits.webkit.org/249684@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 457675 [details].