Closed.

Fixed by Alan Third, see the following for details:

http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=e5015c5d9632a0bf685c093249ae4a7d3e825b13

    -- Anders

On Sat, May 21, 2016 at 9:35 AM, Alan Third <alan@idiocy.org> wrote:

> On Fri, May 20, 2016 at 09:33:52PM +0200, Anders Lindgren wrote:
> > Hi!
> >
> > I gave this patch a try.
> >
> > It works well, the ns port now behaves like the win32 and gtk+ parts of
> > Emacs.
> >
> > Do you want me to push it to master?
>
> If you could, thanks.
>
> > Ps. When the text area doesn't partially overlap a column, the cursor can
> > be drawn in the fringe. It's a bit unfortunate that when it do overlap,
> > only the part of the cursor in the text area is drawn. A worst case
> > scenario is that only a single pixel of the cursor is visible. An ideal
> > solution would be to draw the cursor partially in the text area and
> > partially in the fringe, but without leaving garbage behind when moved.
> > However, this is nothing that we can solve here and now as it would
> require
> > change to all emacs ports and possibly the core system.
>
> Yeah, I was thinking about this but couldn't really see much of a way
> around it. I checked the gtk+ and windows ports operated this way just
> to be sure I wasn't introducing another bug as it does seem wrong. :)
> --
> Alan Third
>