RE: master 5ec2115: Use '…' for ellipsis in truncate-string-to-width by default (bug#41250)

[Drew Adams]

> > That "…" char is pretty useless, in general.
> > Its appearance has nothing in common with that
> > of a real ellipsis, at least when a fixed-width
> > font is used.
> 
> FWIW, I've been using "…" for that ellipsis for a long time now, and
> I use a fixed-width font (misc-fixed-semicondensed) pretty
> much everywhere.  So obviously my opinion disagrees with yours.
> 
> I did end up using "……" at a few places (mostly for the
> outline-minor-mode ellipses), tho, because while I find "..." too long,
> "…" ended up a bit too short for my taste in that case.
> 
> For `truncate-string-to-width` (which is also used to truncate elements
> which are significantly shorter than a line's width (contrary to the
> outline-minor-mode ellipses) typically in multi-column tabular data),
> I found the extra 2 chars very welcome.

OK.

There's an argument for users to be able to customize
the string, beyond just the overall length/width.