bug#48249: 28.0.50; Regression: emacs confused about window configuration due to ido-mode and/or winner-mode

[Gregory Heytings <gregory@heytings.org>]

>
> I've been observing a really annoying behavior regression for the last 
> few months. It was somewhat elusive, but I finally just figured out how 
> to reproduce it, so I'm now reporting the bug.
>
> Emacs periodically gets into a confused state, where simple commands 
> like (switch-to-other-buffer) start doing strange things (switching to 
> the wrong buffer, messing with the window configuration, etc). And the 
> point often gets stuck in the minibuffer, requiring an explicit switch 
> command to get out of there. Killing that emacs frame, and starting a 
> new one (I'm using the emacs server) would fix it for the new frame for 
> a while, until that frame gets confused too.
>
> 1. emacs -Q --eval "(progn (ido-mode 'buffers) (winner-mode))"
> 2. C-x b RET
> 3. C-c LEFT
> 4. M-x
> 5. C-g
>

Thanks for your bug report.

The bug of this specific recipe is due to commit 7c2ebf6e23.

I wonder how many more bug reports are needed before the lesson of that 
failed experiment will finally be drawn.