> On April 10, 2019 2:01:23 PM GMT+03:00, Uwe Brauer <oub@mat.ucm.es> wrote:

   > This is already supported: disable the left fringe, and Emacs will
   > show breakpoints in the left display margin, as it does on text-mode
   > terminals.

Thanks, but forgive my ignorance: what do you mean by 
«disable the left fringe»?