Ticket #23695: 23695.diff

wp-includes/media.php

@@ -778 +778 @@
         $i = 0;
         foreach ( $attachments as $id => $attachment ) {
                 $link = isset($attr['link']) && 'file' == $attr['link'] ? wp_get_attachment_link($id, $size, false, false) : wp_get_attachment_link($id, $size, true, false);
+                $image_meta  = wp_get_attachment_metadata( $id );
+                $orientation = ( $image_meta['height'] > $image_meta['width'] ) ? 'portrait' : 'landscape';
 
                 $output .= "<{$itemtag} class='gallery-item'>";
                 $output .= "
-                        <{$icontag} class='gallery-icon'>
+                        <{$icontag} class='gallery-icon {$orientation}'>
                                 $link
                         </{$icontag}>";
                 if ( $captiontag && trim($attachment->post_excerpt) ) {