bug#43925: 28.0.50; fido-mode can't find-file further back than ~/

[Rasmus]

Hi,

I am trying to replace ido with fido.

One heuristic that I miss from ido is the ability to easily get to 
root via find(ing)-file.

In particular, from emacs -q, I might do something like this

   (let ((default-directory "~/")) 
     (fido-mode) (call-interactively 'find-file) ;; click 
     <backspace><backspace> to get to root )

Being an ido-user, I would expect to be able to go to /home/ by 
clicking backspace and then to root.  But I doesn’t work with 
fido.

I don’t know if I have missed some obvious configuration-step 
here?  I looked through the customization groups of both icomplete 
and minibuffer.

The attached patch expand the file-name if it is “~/”.

I am not really familiar with this part of Emacs so I am not sure 
it’s the right way to go about it.  In particular, I am really not 
sure whether the internal functions (e.g. ‘icomplete--field-beg’) 
are used correctly.


Aside: Another annoyance with fido is that $HOME isn’t being 
abbreviated
to “~” when browsing from root.  E.g.

   (let ((default-directory "/home/")) 
     (fido-mode) (call-interactively 'find-file) ;; now select 
     your username ) 

I would like “/home/$USER” to be abbreviated to “~” (like ido) to 
conserve space.

Any ideas as to where such a change migh be injected to fido?  I 
didn’t see an obvious place.

Thanks in advance,
Rasmus

In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 
3.24.23, cairo version 1.17.3) 
of 2020-10-06 built on X260 
Repository revision: d36cfa21b6b695862dae772a94c63ce3aca8467e 
Repository branch: makepkg Windowing system distributor 'The X.Org 
Foundation', version 11.0.12009000 System Description: Arch Linux 

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0001-lisp-icomplete.el-icomplete-fido-backward-updir-Expa.patch
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