This is likely the flex completion style, not fido-mode itself.

I'll look into it.

João

On Wed, Apr 15, 2020, 00:06 Dmitry Gutov <dgutov@yandex.ru> wrote:

> Thanks for the report.
>
> I can reproduce all three.
>
> FWIW, the "bare" icomplete-mode works fine in these cases.
>
> On 14.04.2020 19:01, Omar Antolín Camarena wrote:
> > Here are 3 scenarios I tested with fido-mode starting from emacs -Q (all
> of these work perfectly with icomplete):
> >
> > 1. Files with spaces.
> >
> > Run emacs -Q and use `M-x fido-mode' to activate fido-mode.
> > Create a file with a space in the name. Use find-file to try to open it.
> As soon as you have a space in the minibuffer, it says "[No matches]".
> >
> > For example, I created a file called "one two", and no other file in my
> home directory starts with "one". In find-file when I type "one" I see the
> expected result: "~/one[ two] [Matched]".
> >
> > If I press TAB to complete I get "one two [No matches]" (from there I
> can press RET to open the file, this bug report is about the "[No matches]"
> which is
> > clearly wrong).
> >
> > If after entering "one" I press space, I get "one  [No matches]", that
> it, I no longer get offered the "one two" completion.
> >
> > 2. Directories with spaces.
> >
> > In emacs -Q use `M-x fido-mode' to activate fido-mode.
> > Create a directory with a space in the name. I created a directory
> called "a b" and put a file called "c" inside. If I run find-file and type
> "a " (that's a followed by space), I see "~/a [No matches]". Even typing "a
> b/" gives me "~/a b/  [No matches]", and neither TAB nor C-M-i
> (icomplete-force-complete) will complete the file "~/a b/c".
> >
> > 3. Menu entries in an info buffer.
> >
> > In emacs -Q use `M-x fido-mode' to activate fido-mode.
> > Use `C-h i' to open the main info directory, pick an entry with a space
> in it. I have a "Date input format" entry from coreutils, for example. Use
> `m' (bound to Info-menu) and type "Date". fido-mode does offer me the
> relevant completions, and in my case, "Date input format" is the only one
> where "Date" is followed by a space. If I type the space nothing happens
> (space is bound to minibuffer-complete-word), no space is entered, the
> candidates don't change. Pressing space again pops up the completions
> buffer.
> >
> > If I use `C-q SPC` to insert a literal space, I get "Date  (No matches)".
> >
> > If I skip the space and keep typing "inpu", it matches "Date input
> format", but pressing TAB to complete it to the full "Date input format"
> again says "(No matches)" ---pressing RET will however open the correct
> manual.
> >
> > ----------
> >
> > This was initially meant to be a bug report for
> `icomplete-fido-backward-updir', whose source code I read (but didn't run).
> It uses `backward-kill-sexp', which means it won't fully go up a directory
> if it has spaces in it. I suggest replacing (backward-kill-sexp 1) with
> (zap-up-to-char -1 ?/), as follows:
> >
> > (defun icomplete-fido-backward-updir ()
> >    "Delete char before or go up directory, like `ido-mode'."
> >    (interactive)
> >    (if (and (eq (char-before) ?/)
> >             (eq (icomplete--category) 'file))
> >        (zap-up-to-char -1 ?/)
> >      (call-interactively 'backward-delete-char)))
> >
> > Before submitting that report I decided to test fido-mode and discovered
> it has more fundamental problems with spaces than that.:)
>
>