bug#70846: Imenu flatten

[Juri Linkov <juri@linkov.net>]

>> >> >> BTW, the manual says in (info "(emacs) Imenu"):
>> >> >>
>> >> >>      You can customize the way the menus are sorted by setting the
>> >> >>   variable ‘imenu-sort-function’.  By default, names are ordered as they
>> >> >>   occur in the buffer; if you want alphabetic sorting, use the symbol
>> >> >>   ‘imenu--sort-by-name’ as the value.  You can also define your own
>> >> >>   comparison function by writing Lisp code.
>> >>
>> >> The "menus" above are pertaining only to popup menus,
>> >> and the variable ‘imenu-sort-function’ can't be used
>> >> to change the sorting order of Imenu completion candidates.
>> >> Only the following customization changes this order:
>> >>
>> >>   (add-to-list 'completion-category-overrides
>> >>                '(imenu (display-sort-function . identity)))
>> >>
>> >> Using this setting is especially essential for Imenu
>> >> on a PDF document with doc-view.el to keep the order
>> >> of chapters for the table of contents.
>> >>
>> >> But I have no idea how to document this customization.
>> >
>> > Now I'm confused: I thought the change you installed was supposed to
>> > make sure the completion candidates are sorted using the same sort
>> > order as determined by imenu-sort-function.  If not, then what did
>> > your change do in this matter?
>>
>> Completions can be sorted only by 'display-sort-function'.
>> There is no other way to sort completions.
>
> Then what did the change you installed do wrt sorting of candidates?

It allows the users to customize the sorting order of
completion candidates displayed by 'imenu'.