The changes required by https://bugs.webkit.org/show_bug.cgi?id=153361 regressed undo and redo in editable text to the point that they’re effectively inaccessible. This follow on work is needed to bring us back to El Capitan parity.
<rdar://problem/26259192>
<rdar://problem/26180300>
Created attachment 278795 [details] Patch
Created attachment 278859 [details] Patch for landing
Comment on attachment 278859 [details] Patch for landing Clearing flags on attachment: 278859 Committed r200876: <http://trac.webkit.org/changeset/200876>
All reviewed patches have been landed. Closing bug.