Toolbar:
- Fix submenus in responsive mode (were ignoring the .hover class on a parent).
- Improve top level items hiding.
Fixes #26476.
Built from https://develop.svn.wordpress.org/trunk@26803


git-svn-id: http://core.svn.wordpress.org/trunk@26690 1a063a9b-81f0-0310-95a4-ce76da25c4cd