To reproduce, drag an attachment element in a web view (where the attachment element is enabled). The attachment should appear in the drag image snapshot, but it does not.
<rdar://problem/43616378>
Created attachment 347862 [details] WIP patch
Created attachment 347881 [details] Patch
Comment on attachment 347881 [details] Patch Clearing flags on attachment: 347881 Committed r235229: <https://trac.webkit.org/changeset/235229>
All reviewed patches have been landed. Closing bug.