Re: [Emacs-diffs] master 55ec674: * lisp/multifile.el: New file, extracted from etags.el

[Dmitry Gutov]

On 27.12.2018 16:39, Stefan Monnier wrote:

> > > I think TRT is to take the above common-prefix-directory, add it to the
> > > prompt, and remove it from each completion candidate: this will keep
> > > substring completion working correctly (and working even better since
> > > it won't uselessly find matches in the common prefix) and will also
> > > clarify where the search takes place.

Now done in master.

But I think it illustrates a common completion pitfall we have:

1. M-x project-find-file (while inside Emacs sources)
2. Type 'GNU', then TAB, then TAB again.
3. It completes to 'GNUmakefile' and insists it is 'Sole completion'. 
Even though e.g. etc/GNUS-USERS exists.

> Not necessarily: we could accumulate the prefix as long as it's the
> sole completion.

I've decided against writing a wrapper that pipes the whole collection 
through 'substring' every time it is called. So for now it also requires 
a flat collection.