private Iterable<ModelChange> getChanges() {
   return myPane.getMergeSession().getApplicableChangesForRoot(myPane.getRootId());
 }
 @Override
 protected void doExecute(AnActionEvent event, Map<String, Object> map) {
   myPane.getMergeSession().applyChanges(getChanges());
   myPane.rehighlight();
 }