@Nullable
 public String getHint(final QuickFix fix) {
   if (myQuickFixes != null) {
     final List<String> list = myQuickFixes.getKeysByValue(fix);
     if (list != null) {
       LOG.assertTrue(list.size() == 1);
       return list.get(0);
     }
   }
   return null;
 }