Prevent various kinds of propagation to RenderView.
Created attachment 445215 [details] Patch
Created attachment 445216 [details] Patch
Created attachment 445574 [details] Patch
Created attachment 445835 [details] Patch
<rdar://problem/86050050>
Committed r286672 (244980@main): <https://commits.webkit.org/244980@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 445835 [details].