bug#32825: 27.0.50; Deterministic window management

[Juri Linkov]

0. emacs -Q

1. create 3 windows, e.g.:
   C-x 3
   C-x 2

2. type a random letter, e.g. 'z'

3. eval it with 'C-x C-e'
   the *Backtrace* buffer with an error appears in some window,
   quit it with 'q'

4. eval again exactly with the same key 'C-x C-e',
   the *Backtrace* buffer appears in another window,
   not where it appeared the previous time.

What is expected: window management should be more deterministic in the
sense that the result of the window operation should be expected beforehand,
not popping windows in random places.