message: Collapse borders in ButtonGroup with isAttached enabled
diff: @@ -27,6 +27,7 @@ const ButtonGroup = ({
  ...(!isLast && !isAttached && { mr: spacing }),
  ...(isFirst && isAttached && { roundedRight: 0 }),
  ...(isLast && isAttached && { roundedLeft: 0 }),
  + ...(!isLast && isAttached && { borderRight: 0 }),
  ...(!isFirst && !isLast && isAttached && { rounded: 0 }),
  });
  });
  