bug#55169: Can't combine window-min-height with window-height

[martin rudalics]

> Also this increases the likelihood of regressions.
> For example, with your latest patch, *Completions*
> are no more fit into a small window, e.g.
> 'C-h f car TAB TAB' pops up too high window.

Likely because the *Completions* window would become smaller than
'window-min-height'.  Either decrease that or provide an explicit
'window-min-height' alist entry of 0 in the 'display-buffer' call.

It's a can or worms we'd open here.

martin