Ticket #19932: 19932.1.patch

wp-admin/revision.php

@@ -169 +169 @@
 $identical = true;
 foreach ( _wp_post_revision_fields() as $field => $field_title ) :
         if ( 'diff' == $action ) {
-                $left_content = apply_filters( "_wp_post_revision_field_$field", $left_revision->$field, $field );
-                $right_content = apply_filters( "_wp_post_revision_field_$field", $right_revision->$field, $field );
+                $left_content = apply_filters( "_wp_post_revision_field_$field", $left_revision->$field, $field, $left_revision, 'left' );
+                $right_content = apply_filters( "_wp_post_revision_field_$field", $right_revision->$field, $field, $right_revision, 'right' );
                 if ( !$content = wp_text_diff( $left_content, $right_content ) )
                         continue; // There is no difference between left and right
                 $identical = false;
         } else {
                 add_filter( "_wp_post_revision_field_$field", 'htmlspecialchars' );
-                $content = apply_filters( "_wp_post_revision_field_$field", $revision->$field, $field );
+                $content = apply_filters( "_wp_post_revision_field_$field", $revision->$field, $field, $revision, '' );
         }
         ?>