Thanks, just tried it and I can confirm this is fixed.

On Mon, Aug 9, 2021 at 7:15 AM Alan Third <alan@idiocy.org> wrote:

> On Wed, Feb 10, 2021 at 09:50:03AM +1100, Li Feng wrote:
> > I tested emacs master on a retina display, and it is all good. fringe
> icons
> > are rendered correctly on both internal and external displays. However,
> on
> > low-res external displays the fringe icon rendering is still broken.
>
> I've completely rewritten the fringe bitmap display on the master
> branch. Can you please have a look and see if this is still a problem
> for you?
> --
> Alan Third
>