Make nav menu item add tabs and content consistent with similar tabs on the post edit screen. props corvannoorloos for the initial patch. fixes #26757.

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git-svn-id: http://core.svn.wordpress.org/trunk@27086 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove unnecessary assignment and concatenation from the_date() and get_the_date().

props juliobox.
fixes #27181.
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git-svn-id: http://core.svn.wordpress.org/trunk@27087 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Correct @return value for get_the_date().

props TobiasBg.
fixes #27181.
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git-svn-id: http://core.svn.wordpress.org/trunk@27088 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revert [27228], as it doesn't work with SCRIPT_DEBUG off.

see #27175.
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git-svn-id: http://core.svn.wordpress.org/trunk@27089 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Update Backbone to version 1.1.2.

props gcorne.
fixes #27182.
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git-svn-id: http://core.svn.wordpress.org/trunk@27090 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Bump.

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git-svn-id: http://core.svn.wordpress.org/trunk@27091 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Correct PHPDoc return description for `get_boundary_post()`.

Props ericlewis.
Fixes #22950.

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git-svn-id: http://core.svn.wordpress.org/trunk@27092 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Build: Update version of grunt-autoprefixer devDependency.

The update includes a new version of Autoprefixer which now supports the `ms-touch-action` prop for IE10.
Run `grunt autoprefixer:core` to re-add the missing props in media-view.css.
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git-svn-id: http://core.svn.wordpress.org/trunk@27093 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-admin/includes/template.php.

Props shelob9 for the initial patch. Props kpdesign.
Fixes #26089.

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git-svn-id: http://core.svn.wordpress.org/trunk@27094 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Access class directly instead of using `this` in the `shortcodeAttrs` method of any factory-generated `wp.media.collection`.

Fixes #27183.


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git-svn-id: http://core.svn.wordpress.org/trunk@27095 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add core support for Playlists and Video Playlists.

* Playlists operate like galleries in the admin. 
* Provide default UI and JS support in themes using MediaElement and Backbone. 
* The shortcodes are clickable, editable, and configurable using the media modal. 
* Playlists support images for each item, whether or not the current theme supports images for `attachment:audio` and `attachment:video`
* Playlists respond to `$content_width` and resize videos accordingly.
* All playlist data is included inline, using a script tag with `type="application/json"`, allowing anyone to unenqueue the WP playlist JS and roll their own.
* Playlist styles are minimal and work out of the box in the last 5 default themes. They inherit and adapt to the current theme's font styles, and their rules are easily overrideable.

See #26631.


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git-svn-id: http://core.svn.wordpress.org/trunk@27096 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation improvements for `wp_get_playlist()`.

* Adds a missing `@param` description in the PHPDoc.
* Adds hook documentation for the `post_playlist` filter.
* Other comment cleanup.

Built from https://develop.svn.wordpress.org/trunk@27240


git-svn-id: http://core.svn.wordpress.org/trunk@27097 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Spacing fixes for code introduced in [27239].

See #26631

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git-svn-id: http://core.svn.wordpress.org/trunk@27098 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Load default settings state when creating a new playlist in the media modal. Add a few missing inline `@this` annotations in `media-editor.js`.

See #26631.


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git-svn-id: http://core.svn.wordpress.org/trunk@27099 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove a few unnecessary jQuery selectors added in [27239]. Playlists don't exist in some older contexts that galleries do.

See #26631.


Built from https://develop.svn.wordpress.org/trunk@27243


git-svn-id: http://core.svn.wordpress.org/trunk@27100 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Supply mime-type instead of extension for an item's `type` property in playlist JSON.

See #26631.


Built from https://develop.svn.wordpress.org/trunk@27244


git-svn-id: http://core.svn.wordpress.org/trunk@27101 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Get the proper image size for an item's thumb in playlist JSON.

See #26631.


Built from https://develop.svn.wordpress.org/trunk@27245


git-svn-id: http://core.svn.wordpress.org/trunk@27102 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add Oxford comma to password hint.

props trepmal.
fixes #26457.
Built from https://develop.svn.wordpress.org/trunk@27246


git-svn-id: http://core.svn.wordpress.org/trunk@27103 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix theme preview URL for themes loaded via AJAX on Install Themes screen.

props ocean90.
fixes #27128.
Built from https://develop.svn.wordpress.org/trunk@27247


git-svn-id: http://core.svn.wordpress.org/trunk@27104 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix thickbox positioning if toolbar is not present.

fixes #26745.
Built from https://develop.svn.wordpress.org/trunk@27248


git-svn-id: http://core.svn.wordpress.org/trunk@27105 1a063a9b-81f0-0310-95a4-ce76da25c4cd