On Wed, May 1, 2019 at 7:09 AM Ergus <spacibba@aol.com> wrote:
>
> Should we consider to add this functionality already to the master
branch??
>
[...]
> So I am waiting for your approve or new suggestions/comments/corrections.

I have an aesthetic suggestion.  In the current implementation the
fill-column char is, by default, always drawn with the background of the
default face, overriding any other background such as region highlighting.
That leads to an effect that I suspect many users will find jarring.  See
the attached screenshot a.png.  You might consider using the same
background for the fill-column char as you do for the preceding stretch
glyph and subsequent fill to end of line.  The attached b.png illustrates
what that would look like.