private static Set<SourceFolder> getSourceFolders(Module module) {
    Set<SourceFolder> result = new HashSet<>();
    ContentEntry[] contentEntries = ModuleRootManager.getInstance(module).getContentEntries();
    for (ContentEntry contentEntry : contentEntries) {
      for (SourceFolder folder : contentEntry.getSourceFolders()) {
        if (folder.getFile() == null) continue;
        result.add(folder);
      }
    }
    return result;
  }
private static Set<SourceFolder> getSourceFolders(Module module)