bug#6830: widget-complete bad completions in :type 'file

[Stefan Monnier]

> Then it looks like my analysis was partially incorrect: I assumed that
> the problem was with the value of `before_field', but it actually is
> with the value of `field'.  (Same reason, though: sorting two items
> whose keys compare equal.)

Ideally, the cursor position should not be considered as "in the
boundary", so the boundary overlay should not be considered for
determining `field'.
For that, I'd guess that you'd want the boundary's marker to use the
insertion type t.  But AFAIK, the code already sets its type to t.
So I'm not sure what's going on, here.


        Stefan