private void addGroupPlusElements(String text, GroupingElement group, List<? extends SimpleErrorData> children) {
    final List<NavigatableMessageElement> elements = new ArrayList<>();
    for (SimpleErrorData child : children) {
      elements.add(new MyNavigatableWithDataElement(
        myProject, child.getKind(), group, child.getMessages(), child.getVf(), NewErrorTreeViewPanel.createExportPrefix(-1), NewErrorTreeViewPanel.createRendererPrefix(-1, -1))
      );
    }

    synchronized (myLock) {
      myGroupNames.add(text);
      myGroupNameToElementMap.put(text, group);
      myGroupNameToMessagesMap.put(text, elements);
    }
  }
private void addGroupPlusElements(String text, GroupingElement group, List<? extends SimpleErrorData> children)