<rdar://problem/71212909>
Addresses a bug in the placeholder mechanism I landed to act as a "halfway point" between Ref-counted display list items and fully concurrent display list processing.
Created attachment 413663 [details] Patch
Comment on attachment 413663 [details] Patch Thanks for the review!
Committed r269617: <https://trac.webkit.org/changeset/269617> All reviewed patches have been landed. Closing bug and clearing flags on attachment 413663 [details].