bug#56532: 27.2; Ido C-f in read-file-name inserts twice the initial name

[Eli Zaretskii]

> Date: Wed, 13 Jul 2022 11:27:11 +0200
> From: Tobias Bora <tobias.bora@gmail.com>
> 
> If you enable ido with (setq ido-auto-merge-work-directories-length -1)
> and evaluate:
> 
> (read-file-name  "Picture name:" "/tmp" nil nil "defaultname.png")
> 
> and go at the end of the buffer with C-e (not sure why the cursor is not
> there by default), and press C-f to come back to a normal file prompt
> (not using ido), then the initial text is written one more time, so the
> prompt is now:
> 
> /tmp/defaultname.png*defaultname.png
> 
> where * is the position of the cursor. I would expect C-f in that case
> to just prompt /tmp/defaultname.png.

Is this in "emacs -Q"?  Because I cannot reproduce the problem: when I
type C-f and get to the end of the file name, Emacs says "[End of
buffer]", and that's all.

Could it be due to some customizations of yours?  I see a lot of
active modes that are not turned on by default.