Avoid inadvertently adding admin page titles as classes for admin menu submenu items.

fixes #28817.
Built from https://develop.svn.wordpress.org/trunk@29083


git-svn-id: http://core.svn.wordpress.org/trunk@28869 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: fix z-index of attachment "check"

See #24716.

Built from https://develop.svn.wordpress.org/trunk@29084


git-svn-id: http://core.svn.wordpress.org/trunk@28870 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: 

* The "Edit Image" link in the attachment modal details is redundant.
* After an attachment is deleted in the modal, automatically move to the next attachment in the library. If there are no attachments left, close the modal.

See #24716.

Built from https://develop.svn.wordpress.org/trunk@29085


git-svn-id: http://core.svn.wordpress.org/trunk@28871 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: 

* Move the grid down via CSS transition when the Screen Options slide open.
* Remove some unused CSS for grid options.

See #24716.

Built from https://develop.svn.wordpress.org/trunk@29086


git-svn-id: http://core.svn.wordpress.org/trunk@28872 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: "Add New" should open and close, not just open.

See #24716.

Built from https://develop.svn.wordpress.org/trunk@29087


git-svn-id: http://core.svn.wordpress.org/trunk@28873 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid, in the Edit Attachment modal: 

* Label the fields under the attachment a la the Edit Media page
* Move the audio and video previews above the info
* Remove the audio / video icon display. Unnecessary.
* Ensure that `width` and `max-width` are set for `.mejs-container`

See #24716.

Built from https://develop.svn.wordpress.org/trunk@29088


git-svn-id: http://core.svn.wordpress.org/trunk@28874 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: 

* Don't store multiple references to the Edit Attachments frame.
* Fix keyboard navigation event delegation and proxy.
* Remove redundant function calls.

See #24716.

Built from https://develop.svn.wordpress.org/trunk@29089


git-svn-id: http://core.svn.wordpress.org/trunk@28875 1a063a9b-81f0-0310-95a4-ce76da25c4cd