Inline documentation for hooks in wp-admin/edit-tags.php.

Props pauldewouters for the initial patch.
Fixes #25532.

Built from https://develop.svn.wordpress.org/trunk@26274


git-svn-id: http://core.svn.wordpress.org/trunk@26179 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Widgets:
- Remove the !important styles that were overriding the widget width when expanded.
- Fix missing border-bottom from widgets when dragged and expanded.
Props shaunandrews, see #26117.
Built from https://develop.svn.wordpress.org/trunk@26275


git-svn-id: http://core.svn.wordpress.org/trunk@26180 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Heartbeat: use cached $document instead of $(document), props TobiasBg, see #25073
Built from https://develop.svn.wordpress.org/trunk@26276


git-svn-id: http://core.svn.wordpress.org/trunk@26181 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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.

Built from https://develop.svn.wordpress.org/trunk@26284


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