bug#19972: Font size change doesn't update (window-total-width)

[Eli Zaretskii]

> From: Steve Purcell <steve@sanityinc.com>
> Date: Mon, 2 Mar 2015 07:57:26 +0000
> 
> - Consider the case of full-screen frames, which never change in pixel size.

They do for me.  See the previous messages.

> So there really shouldn’t be any assumption that the frame size will 
> necessarily change when the font changes.

In this case, Emacs itself changes the frame size, so it can expect it
to change.

I think there's some X event due to the window manager that then
resizes the frame back, but we either don't react to it, or somehow
interpret it incorrectly.