@NotNull
          @Override
          public Collection<AbstractTreeNode<?>> getChildren() {
            Project project = Objects.requireNonNull(getProject());
            Set<AbstractTreeNode<?>> result = new LinkedHashSet<>();
            PsiManager psiManager = PsiManager.getInstance(project);
            for (VirtualFile virtualFile : ProjectRootManager.getInstance(project).getContentRoots()) {
              PsiDirectory directory = psiManager.findDirectory(virtualFile);
              if (directory == null) continue;
              result.add(new PsiDirectoryNode(getProject(), directory, getSettings()) {
                @Override
                protected boolean shouldShowModuleName() {
                  return false;
                }
              });
            }
            return result;
          }
@NotNull
          @Override
          public Collection<AbstractTreeNode<?>> getChildren()