private boolean isInsideGutterWhitespaceArea(@NotNull MouseEvent e) {
    EditorMouseEventArea area = getMouseEventArea(e);
    return area == EditorMouseEventArea.FOLDING_OUTLINE_AREA &&
           myGutterComponent.convertX(e.getX()) > myGutterComponent.getWhitespaceSeparatorOffset();
  }
private boolean isInsideGutterWhitespaceArea(@NotNull MouseEvent e)