private @Nullable FoldingRegionWindow getWindowRegion(@NotNull FoldRegion hostRegion) {
    FoldingRegionWindow window = hostRegion.getUserData(FOLD_REGION_WINDOW);
    return window != null && window.getEditor() == myEditorWindow ? window : null;
  }
private @Nullable FoldingRegionWindow getWindowRegion(@NotNull FoldRegion hostRegion)