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Use class_exists() rather than is_admin() as otherwise the unit tests won't work without a WP_ADMIN hack. see #19342.
git-svn-id: http://svn.automattic.com/wordpress/trunk@19450 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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@ -1806,7 +1806,7 @@ add_action( 'admin_enqueue_scripts', array( 'WP_Internal_Pointers', 'enqueue_scr
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* @return WP_Screen Screen object.
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*/
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function convert_to_screen( $hook_name ) {
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if ( ! is_admin() ) {
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if ( ! class_exists( 'WP_Screen' ) ) {
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_doing_it_wrong( 'convert_to_screen(), add_meta_box()', __( "Likely direct inclusion of wp-admin/includes/template.php in order to use add_meta_box(). This is very wrong. Hook the add_meta_box() call into the add_meta_boxes action instead." ), '3.3' );
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return (object) array( 'id' => '_invalid', 'base' => '_are_belong_to_us' );
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}
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