@Override
 public void restoreOriginalContent() {
   final MergeContent mergeContent = getMergeContent();
   if (mergeContent == null) return;
   mergeContent.restoreOriginalContent();
 }
 public void applyChanges() {
   MergeContent mergeContent = getMergeContent();
   if (mergeContent != null) {
     mergeContent.applyChanges();
   }
 }