bug#32825: 27.0.50; Deterministic window management

[Juri Linkov]

>> What is much worse is that subsequent calls in a narrow frame
>> display the *Backtrace* buffer each time in another window -
>> the window is not reused where it was displayed previously.
>
> Does 'display-buffer-in-previous-window' fail and if so why?

Yes, it fails.  Do you see the same?

I only added display-buffer-below-selected to pop-to-buffer
of "*Backtrace*" after display-buffer-in-previous-window,
and in `emacs -Q` with 3 windows where the bottom window is
very low, subsequent errors are displayed in different windows.