TinyMCE: update the default style for html5-captions, props obenland fixes #26642
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Throw a user notice when the editor ID used for TinyMCE contains brackets, props nacin, fixes #27601 
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When autosaving a new post for the first time after a title was typed, cancel the autosave if the user is submitting the form. (Includes a precommit fix for customize-controls.css.) Props Nessworthy, davidmarichal, fixes #27657
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Fix a typo in the PHPDoc description for the `WP_Http_Curl->max_body_length` property.

Props eightface.
Fixes #27681.

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git-svn-id: http://core.svn.wordpress.org/trunk@27782 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid an undefined index notice in wp_http_validate_url().

props jesin.
fixes #27684.
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git-svn-id: http://core.svn.wordpress.org/trunk@27783 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Customizer: Add `height: auto;` for `select[multiple]`.

fixes #27662.
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git-svn-id: http://core.svn.wordpress.org/trunk@27784 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix typo in hook description for `async_upload_{$type}`.
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git-svn-id: http://core.svn.wordpress.org/trunk@27785 1a063a9b-81f0-0310-95a4-ce76da25c4cd
RTL: Fix taxonomy quick edit list alignment.

props SergeyBiryukov.
fixes #27629.

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git-svn-id: http://core.svn.wordpress.org/trunk@27786 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Don't pass variables by reference.

props markjaquith.
fixes #27656.

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git-svn-id: http://core.svn.wordpress.org/trunk@27787 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Theme Installer: Fix displaying of errors.

props SergeyBiryukov.
fixes #27640.

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Theme Installer: Better responsive styles for feature filters.

props matveb.
fixes #27661.

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Revert the changes made to `data.title` in playlist Underscore templates in [27869]. `{{ data.title }}` causes the title to be double-encoded on the front end.

See #27574.


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Theme Installer: Use JSONP for api.wordpress.org requests.

fixes #27639.

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Theme Installer: Don't encode description entities/HTML.

props johnbillion.
fixes #27641.

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Theme Installer: Separate API from an event handler to avoid issues where a false return value stops the event.

see #27055.

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Better checks for contributors when saving posts.

props dd32, kovshenin, plocha.
see #27452.

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Inline documentation for remaining hooks in wp-admin/includes/upgrade.php.

Props jackreichert, vancoder.
Fixes #27646.

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WP_Widget: Introduce `is_preview()` method.

With the Widget Customizer it's possible that previewed widgets can leak data outside of Customizer, when the widget uses the cache API.
The Customizer calls the regular update callback which should already refresh the cache. Since cache additions aren't blocked yet the cache can be filled with preview data.
To prevent this issue `WP_Widget::is_preview()` will return true, when `$wp_customize->is_preview()` returns true. If `is_preview()` is true, cache additions are suspended via `wp_suspend_cache_addition()`. Make sure your object cache drop-in has implemented `wp_suspend_cache_addition()`.

`is_preview()` can/should also be used inside `WP_Widget::widget()`, see WP_Widget_Recent_Posts or WP_Widget_Recent_Comments for examples.

For more info see IRC logs: http://irclogs.wordpress.org/chanlog.php?channel=wordpress-dev&day=2014-04-02&sort=asc#m824279

props westonruter.
fixes #27538.
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git-svn-id: http://core.svn.wordpress.org/trunk@27796 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix whitespace around `$GLOBALS['_wp_deprecated_widgets_callbacks'] `.
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git-svn-id: http://core.svn.wordpress.org/trunk@27797 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Widget Customizer: Minor code cleanup.

* Remove type hinting from `WP_Customize_Widgets`
* Rename `inject_preview_css` to `print_preview_css`
* Remove stray `@todo`

fixes #27534.
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