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use is_a() instead of is_object() in screen_meta(). See #14579
git-svn-id: http://svn.automattic.com/wordpress/trunk@15518 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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@ -1634,7 +1634,7 @@ function screen_meta($screen) {
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if ( is_string($screen) )
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$screen = convert_to_screen($screen);
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if ( is_object($table) )
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if ( is_a($table, 'WP_List_Table') )
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list( $screen_columns ) = $table->get_column_headers();
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$meta_screens = array('index' => 'dashboard');
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