bug#38181: Actual height of mode-line not taken into account

[martin rudalics]

> There is, for some value of "display": this function actually
> generates a glyph row in the glyph matrix.

The same thing happens with 'pos-visible-in-window-p', I suppose.

>> Eli, I think this could go into Emacs 28.  WDYT?
>
> No, it's too radical, and the problem it fixes is too obscure.  Let's
> install it on master, please.

I'll wait a couple of days and do that if Carlos doesn't see any
problems.

Thanks, martin