<rdar://problem/41050528>
This was caught by a failing test on macOS Mojave: fast/forms/hidpi-textfield-background-bleeding.html.
Created attachment 342675 [details] Patch
Comment on attachment 342675 [details] Patch Clearing flags on attachment: 342675 Committed r232799: <https://trac.webkit.org/changeset/232799>
All reviewed patches have been landed. Closing bug.