bug#29198: Cursor fringe arrow indicator not updating.

[Eli Zaretskii]

> Date:  Tue, 07 Nov 2017 12:48:35 -0800
> From:  Keith David Bershatsky <esq@lawlist.com>
> Cc:  29198@debbugs.gnu.org
> 
> Yes, "M-x" triggers an immediate removal of the old indicator and places the 
> new indicator at the current line position.
> 
> I would recommend adding an exception to the redisplay optimization to check 
> for a change of placement to the built-in overlay fringe arrow indicator.  
> Since the fringe arrow indicator has been an existing feature of Emacs for 
> quite some time (built-in to xdisp.c), it should (in my opinion) work out of 
> the box without the need for the user to force a redisplay with additional 
> Lisp code.

The other features which display the fringe arrow work correctly, so
evidently there is a way of moving it from Lisp.