Widgets:
- Fix support for expanding (wide) widgets in the Inactive Widgets area.
- Remove resizing of the sidebars height.
- Stop removing unneeded "for" attributes from labels inside the widgets. Was a fix for IE6 odd behaviour.  

See #26117.
Built from https://develop.svn.wordpress.org/trunk@26277


git-svn-id: http://core.svn.wordpress.org/trunk@26182 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Appearance: Fix a PHP Notice when the update transient isn't available (for example, due to a timeout or being used offline). See #25948

Built from https://develop.svn.wordpress.org/trunk@26278


git-svn-id: http://core.svn.wordpress.org/trunk@26183 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Translate the debug update email for development installs. Props Nao for initial patch. See #25667

Built from https://develop.svn.wordpress.org/trunk@26279


git-svn-id: http://core.svn.wordpress.org/trunk@26184 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Themes page: Remove a z-index which caused the Current Theme overlay to overlay menu's, that otherwise appears unused. See #25948 

Built from https://develop.svn.wordpress.org/trunk@26280


git-svn-id: http://core.svn.wordpress.org/trunk@26185 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Widgets: fix the placeholders dimensions so the sidebars don't jump when dragging a widget, see #25821
Built from https://develop.svn.wordpress.org/trunk@26281


git-svn-id: http://core.svn.wordpress.org/trunk@26186 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Themes: Add a get_theme_update_available() function to retrieve an update link and use it on the Themes page. See #26078

Built from https://develop.svn.wordpress.org/trunk@26282


git-svn-id: http://core.svn.wordpress.org/trunk@26187 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove the active row theme/plugin styling on Dashboard -> Updates. Fixes #26125

Built from https://develop.svn.wordpress.org/trunk@26283


git-svn-id: http://core.svn.wordpress.org/trunk@26188 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Inline documentation for hooks in wp-admin/my-sites.php.

Props megane9988, kpdesign.
Fixes #25586.

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git-svn-id: http://core.svn.wordpress.org/trunk@26189 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Widgets: split the sidebars in two containers so there are no empty spaces when they are shown in two columns and some are open, other closed. See #25952.
Built from https://develop.svn.wordpress.org/trunk@26285


git-svn-id: http://core.svn.wordpress.org/trunk@26190 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Widgets: fix html for sidebars columns when the theme has only one sidebar. See #25952.
Built from https://develop.svn.wordpress.org/trunk@26286


git-svn-id: http://core.svn.wordpress.org/trunk@26191 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix JSHint errors in widgets.js.

props jorbin.
fixes #26127.
Built from https://develop.svn.wordpress.org/trunk@26287


git-svn-id: http://core.svn.wordpress.org/trunk@26192 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Only show "Add New Theme" block on Manage Themes screen if not Multisite and the user can install themes.

props markoheijnen.
see #25948.
Built from https://develop.svn.wordpress.org/trunk@26288


git-svn-id: http://core.svn.wordpress.org/trunk@26193 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Cleanup on inputs:

* Remove the !important from checkbox and radio border color
* Remove the redundant #wpbody select rule
* Add checkbox and radio inputs to the standard :focus style rules for inputs
* Remove custom border and box shadow styles from .login inputs
* Don't remove the default outline from select elements since webkit doesn't allow borders on selects

Fixes #26120.


Built from https://develop.svn.wordpress.org/trunk@26289


git-svn-id: http://core.svn.wordpress.org/trunk@26194 1a063a9b-81f0-0310-95a4-ce76da25c4cd
MP6: remove left-over plugin reference, see #25858
Built from https://develop.svn.wordpress.org/trunk@26290


git-svn-id: http://core.svn.wordpress.org/trunk@26195 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Dash cleanup.
 * Use wp_add_dashboard_widget() rather than add_meta_box().
 * Use original functions like wp_dashboard_primary(), wp_dashboard_right_now(), wp_dashboard_quick_press() (where possible).
 * Only include plugins section of the news widget when appropriate, which necessitates the set_current_screen() via the ajax action.
 * Remove some debug cruft that was preventing caching and invalidation.
 * Simplify lots of things where possible.
see #25824.

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git-svn-id: http://core.svn.wordpress.org/trunk@26196 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix JSHint errors in image-edit.js.

props dougwollison.
fixes #26000.
Built from https://develop.svn.wordpress.org/trunk@26292


git-svn-id: http://core.svn.wordpress.org/trunk@26197 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Making improvements to new styles added in the MP6 merge, and addressing visual feedback from core team.

Improved and more consistent styling on the widgets & menus pages:

* Use the same visual treatment for both widgets and menus.
* Re-use existing styles from input:focus for draggable elements.
* Use the standard H3 size for widget area titles.
* Re-style the Widgets page drop zone to match drop zone from dashboard.
* Replace the gear icon on Widgets with the standard open/close arrows.
* Remove "Choose a sidebar" header from widget area chooser.

Make open/close arrows more consistent:

* Use the same arrow direction everywhere: pointing down when its container is closed, pointing up when open (following the Dashboard example).
* Set a consistent color for open/close arrows.
* Add a hover color for open/close arrows.
* Make open/close arrows permanently visible; :hover states don't exist on touch.

Make typography and color more consistent:

* Switch all declarations of #dedede to #ddd for simplicity's sake.
* Make H3s the same weight and color as H2s.
* Make select elements the same color as text inputs.
* Make paragraph text #444 so it doesn't look washed out on grey backgrounds.

General improvements:

* Eliminate the border between rows in settings tables.
* Make text and buttons line up in the Customizer.

See #25858.


Built from https://develop.svn.wordpress.org/trunk@26293


git-svn-id: http://core.svn.wordpress.org/trunk@26198 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add an experimental rssjs feed based on the experimental rss.js spec.

This is simply a JSON representation of the RSS 2.0 feed, accessible at /feed/rssjs/ anywhere.

props pento.
see #25639.

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git-svn-id: http://core.svn.wordpress.org/trunk@26199 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix JSHint errors in media-models.js.

props kadamwhite.
fixes #26132.
Built from https://develop.svn.wordpress.org/trunk@26295


git-svn-id: http://core.svn.wordpress.org/trunk@26200 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Widgets: adjust placeholder size to match the widget size. Prevents the widgets from jumping when one is dragged. See #25858.
Built from https://develop.svn.wordpress.org/trunk@26296


git-svn-id: http://core.svn.wordpress.org/trunk@26201 1a063a9b-81f0-0310-95a4-ce76da25c4cd