Ticket #12146: 12146.2.patch

wp-admin/includes/post.php

@@ -1103 +1103 @@
  * @return string html
  */
 function _wp_post_thumbnail_html( $thumbnail_id = NULL ) {
-        global $content_width, $_wp_additional_image_sizes;
+        global $_wp_additional_image_sizes;
+
         $content = '<p class="hide-if-no-js"><a href="#" id="set-post-thumbnail" onclick="jQuery(\'#add_image\').click();return false;">' . esc_html__( 'Set thumbnail' ) . '</a></p>';
 
         if ( $thumbnail_id && get_post( $thumbnail_id ) ) {
-                $old_content_width = $content_width;
-                $content_width = 266;
                 if ( !isset( $_wp_additional_image_sizes['post-thumbnail'] ) )
                         $thumbnail_html = wp_get_attachment_image( $thumbnail_id, array( $content_width, $content_width ) );
                 else
                         $thumbnail_html = wp_get_attachment_image( $thumbnail_id, 'post-thumbnail' );
                 if ( !empty( $thumbnail_html ) ) {
+                        // Downsize the thumbnail HTML to fit in the meta box
+                        if ( preg_match( '#width="([0-9]+)"#i', $thumbnail_html, $width ) && $width[1] > 266 && preg_match( '#height="([0-9]+)"#i', $thumbnail_html, $height ) ) {
+                                $newdims = wp_constrain_dimensions( $width[1], $height[1], 266 );
+                                $thumbnail_html = str_replace( array( $width[0], $height[0] ), array( "width=\"{$newdims[0]}\"", "height=\"{$newdims[1]}\"" ), $thumbnail_html );
+                        }
+
                         $content = '<a href="#" id="set-post-thumbnail" onclick="jQuery(\'#add_image\').click();return false;">' . $thumbnail_html . '</a>';
                         $content .= '<p class="hide-if-no-js"><a href="#" id="remove-post-thumbnail" onclick="WPRemoveThumbnail();return false;">' . esc_html__( 'Remove thumbnail' ) . '</a></p>';
                 }
-                $content_width = $old_content_width;
         }
 
         return apply_filters( 'admin_post_thumbnail_html', $content );