bug#22000: Patch addressing the menu-bar frame-resize interaction

[Vivek Dasmohapatra]

> The major problem with your patch is that it completely breaks the
> initial frame geometry at least here: The nominal (outer) height of
> the initial frame (with emacs -Q) goes down from 749 to 731 pixels.
> The height of the initial window goes down from 35 lines (630 pixels)
> to 33 lines (595 pixels).

Working on it - should be a case of using the container instead of the
menu bar for calculations.

> There should be some.  I have no idea who is responsible for the tool
> bar behavior but IIUC that should be the way to go for the menu bar
> (with different clipping behavior, I suppose).

I could be wrong but it seems to be an intrinsic difference between the
toolbar and the menubar. I'll see if I can figure it out.