@Override
 public void setIgnored(@NotNull ProjectStructureProblemDescription description, boolean ignored) {
   final String id = description.getId();
   if (ignored) {
     myIgnoredProblems.add(id);
   } else {
     myIgnoredProblems.remove(id);
   }
 }
 @Override
 public boolean isIgnored(@NotNull ProjectStructureProblemDescription description) {
   return myIgnoredProblems.contains(description.getId());
 }