In bug #207866 I implemented the override for EditorClient::shouldRevealCurrentSelectionAfterInsertion() in Modern WebKit. This is also needed in Legacy WebKit.
<rdar://problem/59602916>
Created attachment 391194 [details] Patch
Thanks Wenson!
Comment on attachment 391194 [details] Patch Clearing flags on attachment: 391194 Committed r256948: <https://trac.webkit.org/changeset/256948>
All reviewed patches have been landed. Closing bug.