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Paging broken in get_gallery function

  • I am calling the get_gallery function from some of my code in order to get the top 4 images from a specific gallery.
    I noticed it has a handy $limit argument, but when I set this to 4 I get the following PHP error:
    Using $this when not in object context in <path>/wp-content/plugins/nextgen-gallery/lib/ngg-db.php on line 243

    I fixed this by changing the following lines to change references to $this to $result instead:

    // Count the number of images and calculate the pagination
            if ($limit > 0) {
                $result->paged['total_objects'] = intval ( $wpdb->get_var( "SELECT FOUND_ROWS()" ) );
                $result->paged['objects_per_page'] = max ( count( $result ), $limit );
                $result->paged['max_objects_per_page'] = ( $limit > 0 ) ? ceil( $result->paged['total_objects'] / intval($limit)) : 1;
            }

    But every time I upgrade the plugin I lose this fix and have to do it again.
    Can someone fix it in the codebase please?

    http://wordpress.org/extend/plugins/nextgen-gallery/

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