bug#69983: Use category for display-buffer-alist

[Juri Linkov <juri@linkov.net>]

> One problem is that I can't find an alist item to limit
> the window height, i.e. can't find window-max-height
> that would be like window-min-height, but to set a max height.
> Could you suggest such an alist item?

The intention was to have such behavior:
1. after the first call that adds 1 line to the output buffer,
   resize the displayed buffer to 1 line height;
2. after the second call grow the output window height to 2 lines,
   it seems fit-window-to-buffer should do this;
3. after 10th call limit the window height to 10 lines only,
   so later calls should not increase the output window height
   more than 10 lines.

But I can't find a setting for this.

> +		     (let ((window (display-buffer
> +                                    buffer
> +                                    '(display-buffer--maybe-at-bottom
> +                                      (window-min-height . 10)
> +                                      (window-height . fit-window-to-buffer)