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

[Stefan Monnier <monnier@iro.umontreal.ca>]

>> On GNU/Linux, the first overlay in the sorted array happens to be the
>> one whose `field' value is equal to the text property, so find_field
>> works.  On MS-Windows, the first overlay is the one whose value is
>> `completion', so find_field decides that the field begins and ends at
>> the same position.  The rest, as they say, is history.
> Interesting.  The overlays code should be independent of operating
> system.  Any idea what causes the sort order to be different?

> Does the problem go away if in

>     (let ((minibuffer-completion-table collection)
>           (minibuffer-completion-predicate predicate)
>           (ol (make-overlay start end nil nil t)))
>       (overlay-put ol 'field 'completion)

> you also specify a `priority' of (say) 5?


I'm wondering what is this other overlay, why it's here, and why it ends
up sometimes taking precedence,


        Stefan