Revert [29033] pending further discussion. See #28319.
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git-svn-id: http://core.svn.wordpress.org/trunk@28834 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Display plugin install results as "cards" rather than in a list table, first run.

props stephdau, ryelle, tellyworth, melchoyce. see #28785, #28646.


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git-svn-id: http://core.svn.wordpress.org/trunk@28835 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Customizer: Export Previewer instance to wp.customize.previewer, and utilize for Widget Customizer.

props westonruter.
fixes #27666.
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git-svn-id: http://core.svn.wordpress.org/trunk@28836 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Enhance the editor on the Add/Edit Post screens, first run. Props avril, see #28328.
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git-svn-id: http://core.svn.wordpress.org/trunk@28837 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix whitespace, quotes and double patch content in wpautoresize plugin, see #28328
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git-svn-id: http://core.svn.wordpress.org/trunk@28838 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Customizer: Introduce WP_Customize_Control::active() method to determine whether the control is relevant to the current context (i.e. to the current URL being previewed).

Control can indicate its active state by a subclass overriding the 'active_callback' method, by supplying a callable 'active_callback' argument into the control's constructor, or by filtering 'customize_control_active'.

props westonruter.
see #27993.
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git-svn-id: http://core.svn.wordpress.org/trunk@28839 1a063a9b-81f0-0310-95a4-ce76da25c4cd