We should support the key commands to delete to the start of the line and to the end of the line to match platform conventions. The key command to delete to the start of the line and to delete to the end of the line is Command + Delete and Control + K, respectively.
Created attachment 354120 [details]
It is not straighforward to test this change. See bug #191381, comment 2.
Comment on attachment 354120 [details]
Clearing flags on attachment: 354120
Committed r237945: <https://trac.webkit.org/changeset/237945>
All reviewed patches have been landed. Closing bug.