For WK1, we currently set candidate list visibility to NO when performing a dictionary lookup on mousedown due to a temporary selection change. We fixed the WK2 case in https://trac.webkit.org/changeset/205983, but the WK1 case was never addressed.
<rdar://problem/28747712>
Created attachment 293456 [details] Patch
Comment on attachment 293456 [details] Patch Clearing flags on attachment: 293456 Committed r208191: <http://trac.webkit.org/changeset/208191>
All reviewed patches have been landed. Closing bug.