Hello,

I have some questions concerning metadata in minibuffer.el.

1) Five years ago (or more, time flies) we decided to create a defgeneric
completion--adjust-metadata, as of now nothing has been done, do you plan
to do this (Stefan)? Do you want a patch (would be simple in this case,
not what's you had planned)?

2) As many things in minibuffer.el, it is unclear and not documented
what the function in charge of adjusting metadata for flex style (the
sort fns) is intended to do:
Why does it sort completions with the previously generated sort fn and
then sort with the newly generated sort fn on this sorted completions
and so on (Joao)?

This create after some usage huge metadata object (attached an example
which is already quite big but can grow even more), is it expected?
This also generates unexpected duplicate entries in metadata which make
the metadata object even bigger (guess this one is not expected), it is
not a problem in itself (i.e. it is working, assoc pickup the first one
in alist in such cases) but looks unclean and may create other problems
if used extensively.

PS: I am now travelling and may not be able to answer or work on this
before november.
In the attached file is the compiled object, I can provide the not
compiled version, one can reproduce by running completion-at-point with
helm-mode enabled and helm-completion-style set to 'emacs, then hit C-h
d (flex have to be in completion-styles and used).

Thanks.

-- 
Thierry