When a plain URL or email address is selected in the editor and "Insert/edit link" is clicked, pre-populate the URL field with the URL or `mailto:<email-address>`.

Props tillkruess.
Fixes #19992.

Built from https://develop.svn.wordpress.org/trunk@28705


git-svn-id: http://core.svn.wordpress.org/trunk@28522 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Live update the menu item title when the user is editing the "Navigation Label" field.

Props celloexpressions.
See #23076.

Built from https://develop.svn.wordpress.org/trunk@28707


git-svn-id: http://core.svn.wordpress.org/trunk@28523 1a063a9b-81f0-0310-95a4-ce76da25c4cd