bug#43120: 28.0.50; fido-mode: M-j before completions appear selects wrong choice

[Juri Linkov]

>> +(defun icomplete-ret ()
>> +  "Exit minibuffer for icomplete."
>> +  (interactive)
>> +  (if (and icomplete-show-matches-on-no-input
>> +           (car completion-all-sorted-completions)
>> +           (eql (icomplete--field-end) (icomplete--field-beg)))
>> +      (icomplete-force-complete-and-exit)
>> +    (exit-minibuffer)))
>
> This changed the behavior of RET from `minibuffer-complete-and-exit' to
> `exit-minibuffer'. Was that intention? What I noticed is the following.

I confirm that this change broke icomplete-mode.  Here is a test case
that shows regression:

M-x icomplete-mode RET
M-x rgr RET

  Lisp error: (error "‘rgr’ is not a valid command name")

Until yesterday it used to run 'rgrep'.