bug#51411: NS port cleanups

[Po Lu]

Alan Third <alan@idiocy.org> writes:

> When there are two rectangles we use NSRectClipList, which behaves a
> little differently. It uses the union of the two rectangles to
> intersect with the existing clipping. So you'll have to do something
> like
>
>     u = NSUnionRect (r[0], r[1]);
>     DPSrectclip (ctx, NSMinX (u), NSMinY (u),
>                  NSWidth (u), NSHeight (u));

Yes, thanks, please see my other mail.  Thanks!