bug#46034: Feature request: add variable for automatically selecting the apropos window

[Juri Linkov]

> Feature request for "apropos.el": add a variable for automatically
> selecting the apropos window when it is shown.
>
> Please add an "apropos-window-select" variable that is analogous to
> help.el's "help-window-select".

I don't know why there is this too specific option 'help-window-select'.
It seems there are many other windows that needs to be customized
to select them.  Wouldn't it be more general solution to use
display-buffer-alist, maybe with something like:

(add-to-list 'display-buffer-alist '("\\*Help\\*" nil (post-display . 
select-window)))