[wp-trac] [WordPress Trac] #25618: Fix opening of Media Manager in Customizer

[WordPress Trac]

#25618: Fix opening of Media Manager in Customizer
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 Reporter:  westonruter   |       Owner:  nacin
     Type:  defect (bug)  |      Status:  closed
 Priority:  normal        |   Milestone:  3.8
Component:  Appearance    |     Version:
 Severity:  normal        |  Resolution:  fixed
 Keywords:  has-patch     |
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Comment (by westonruter):

 @nacin: The `require_once` addresses an issue when you try to subclass
 `WP_Customize_Control` before the Customizer is initialized (e.g. the
 attached `test-control.php` plugin). To do this subclass, you have to
 `require` `class-wp-customize-control.php` up front, but then when
 `WP_Customize_Manager` is instantiated later, its constructor also does a
 `require` for that same file, resulting in a fatal class redeclaration
 error. It seems `require_once` should be the default method for importing
 libraries, whereas `require` the default for templates/partials.

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Ticket URL: <http://core.trac.wordpress.org/ticket/25618#comment:7>
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