@Nullable
  private Icon getSourceFolderIcon(JpsModuleSourceRootType<?> type) {
    for (ModuleSourceRootEditHandler<?> handler : myEditHandlers) {
      if (handler.getRootType().equals(type)) {
        return handler.getFolderUnderRootIcon();
      }
    }
    return null;
  }
@Nullable
  private Icon getSourceFolderIcon(JpsModuleSourceRootType<?> type)