@Nullable
  public static Icon getSourceRootFileLayerIcon(@NotNull JpsModuleSourceRootType<?> rootType) {
    ModuleSourceRootEditHandler<?> handler = ModuleSourceRootEditHandler.getEditHandler(rootType);
    return handler != null ? handler.getRootFileLayerIcon() : null;
  }
@Nullable
  public static Icon getSourceRootFileLayerIcon(@NotNull JpsModuleSourceRootType<?> rootType)