Editor: Shrink the font size for the chosen format so it fits in more locales.

props SergeyBiryukov.
see #27903, for trunk.

Built from https://develop.svn.wordpress.org/trunk@28180


git-svn-id: http://core.svn.wordpress.org/trunk@28011 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE: Restore old wordpress_adv_hidden editor parameter to enable force-showing the kitchen sink.

props azaozz.
see #27963, for trunk.

Built from https://develop.svn.wordpress.org/trunk@28181


git-svn-id: http://core.svn.wordpress.org/trunk@28012 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Refinements for asynchronous rendering in `wp.mce.media.PlaylistView`:

* Add `visibility: hidden` as an inline style to `<audio>` tags, there is a race with the stylesheet which can get enqueued in the body and loaded in the footer.
* When creating new instances of `MediaElementPlayer`, always push them onto a stack. Lone views can be responsible for multiple instances of the same shortcode on render.
* Rename `wp.media.mixin.unsetPlayer()` to `wp.media.mixin.unsetPlayers()` to reflect the above.
* Call `wp.media.mixin.unsetPlayers()` on the view's `unbind()` method, instead of inline in the `render()` method
* Make sure `WPPlaylistView` is instantiated for each editor instance
* Ensure that the `No Items Found` view state is not rendered when attachments actually do exist.

Props gcorne, wonderboymusic.
See #27899.



Built from https://develop.svn.wordpress.org/trunk@28182


git-svn-id: http://core.svn.wordpress.org/trunk@28013 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Persisting `<track>` elements as the body of a `[video]` shortcode in MCE Views:

* When generating the view's HTML, ensure that the shortcode's `content` is added to the model
* Add a `PostProcess` event in the `wpview` plugin to properly return the shortcode when the editor mode is toggled, ensuring that elements in the body are not dropped.

Props azaozz, wonderboymusic.
See #27915.



Built from https://develop.svn.wordpress.org/trunk@28183


git-svn-id: http://core.svn.wordpress.org/trunk@28014 1a063a9b-81f0-0310-95a4-ce76da25c4cd