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