* Show the warning in the context menu (on desktop only) in addition
to the reference dialog.
* Add more details to the warning in reference dialog, and adjust
spacing around it to make it more noticeable.
Bug: T208981
Bug: T212609
Depends-On: I6ca605ddd580d6259952c8799ecdca08da07474a
Change-Id: I23cc02f651c15b3276613d32a0c2537032f731c2