Avoid a PHP notice if you manually navigate to `/wp-admin/install.php?step=2`. See #28577.
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git-svn-id: http://core.svn.wordpress.org/trunk@29292 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: Improve position of fixed toolbar at small-screen sizes.

see #28842.
Built from https://develop.svn.wordpress.org/trunk@29517


git-svn-id: http://core.svn.wordpress.org/trunk@29293 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Admin Menu: Auto fold the menu at 960px.

This gives us some more room at the post edit screen.

props vinod dalvi for initial patch.
fixes #28592.
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git-svn-id: http://core.svn.wordpress.org/trunk@29294 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Restore focus styles for checkboxes and radio buttons. Broken since [29465].

fixes #28262.
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git-svn-id: http://core.svn.wordpress.org/trunk@29295 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Dashicons: Update to the latest dashicons files.

New icons:
* .dashicons-calendar-alt (f508)
* .dashicons-carrot (f511)
* .dashicons-grid-view (f509)
* .dashicons-index-card (f510)

props liljimmi, melchoyce, empireoflight.
see #27844.
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