static @Nullable TextEditorImpl findSinglePsiAwareEditor(@NotNull List<? extends FileEditor> fileEditors) {
    TextEditorImpl result = null;
    for (FileEditor fileEditor : fileEditors) {
      if (fileEditor instanceof TextEditorImpl) {
        if (result == null) {
          result = (TextEditorImpl)fileEditor;
        }
        else {
          return null;
        }
      }
    }
    return result;
  }
static @Nullable TextEditorImpl findSinglePsiAwareEditor(@NotNull List<? extends FileEditor> fileEditors)