@NotNull
  private static Set<ModuleSourceRootEditHandler<?>> getHandlersForSelectedRoots(@NotNull RootsSelection selection) {
    Set<ModuleSourceRootEditHandler<?>> selectedRootHandlers = new HashSet<>();
    for (SourceFolder root : selection.mySelectedRoots) {
      ContainerUtil.addIfNotNull(selectedRootHandlers, ModuleSourceRootEditHandler.getEditHandler(root.getRootType()));
    }
    return selectedRootHandlers;
  }
@NotNull
  private static Set<ModuleSourceRootEditHandler<?>> getHandlersForSelectedRoots(@NotNull RootsSelection selection)