Instead of checking for all `WI.Collecion` that are not `WI.CanvasCollection`, we should be more specific as to which types of collections we allow.
Created attachment 351656 [details] Patch
Comment on attachment 351656 [details] Patch rs=me
Comment on attachment 351656 [details] Patch Clearing flags on attachment: 351656 Committed r236920: <https://trac.webkit.org/changeset/236920>
All reviewed patches have been landed. Closing bug.
<rdar://problem/45091950>