@NotNull
  private static Border createEditorFragmentBorder() {
    Border outsideEditorBorder = JBUI.Borders.customLine(getBorderColor(), 1);
    Border insideEditorBorder = JBUI.Borders.empty(2);
    return BorderFactory.createCompoundBorder(outsideEditorBorder, insideEditorBorder);
  }
@NotNull
  private static Border createEditorFragmentBorder()