There are small interface differences between GTK's implementation and WinCairo's socket server.
Created attachment 372503 [details] PATCH
Created attachment 372840 [details] PATCH
Comment on attachment 372840 [details] PATCH Clearing flags on attachment: 372840 Committed r246860: <https://trac.webkit.org/changeset/246860>
All reviewed patches have been landed. Closing bug.
<rdar://problem/52220782>