bug#57082: 29.0.50; emacs-news-view-mode breakage

[Gregory Heytings]

> > > > For the NEWS file though (and especially programming modes). I still 
> > > > think it'd be great to put the buttons in the fringe. That way the 
> > > > buttons would never disrupt the contents of the file, e.g. by 
> > > > changing how the indentation looks.
> > >
> > > Agreed, the clickable buttons in the fringe would be great, and it's 
> > > easy to implement.
> >
> > Some users disable both fringes, or only the left fringe, though.
>
> Then it should fall back to other methods.

Yes, I mentioned this only to remind that another methods should be 
available.  And if another method is available, perhaps the chosen method 
should also depend on a configuration variable.  Some users may prefer 
in-buffer buttons even if they do not disable the fringes.