bug#39822: 27.0.90; Cannot set *Completions* buffer height using display-buffer-alist

[martin rudalics]

> It seems better to handle the temp-buffer setup in the buffer display action
> functions (currently there are two such functions that handle temp-buffer:
> 'display-buffer--maybe-at-bottom' and 'display-buffer-in-direction'),
> if this will help to get rid of monstrous macro 
'with-displayed-buffer-window'.

Then go for it.

martin