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

[Eli Zaretskii]

> From: "Jan D." <jan.h.d@swipnet.se>
> Date: Mon, 2 Mar 2015 21:19:14 +0100
> Cc: "steve@sanityinc.com" <steve@sanityinc.com>,
>  "19972@debbugs.gnu.org" <19972@debbugs.gnu.org>
> 
> > I meant where/how does Emacs know that its request to resize was
> > denied?
> 
> When an X window is resized, it gets a ConfigureNotify event.  When the 
> resize is denied, no event arrives.  That is why Emacs on X only considers 
> ConfigureNotify as resizes.  If lisp code tries to resize, we make the 
> request, but nothing is updated until we get a ConfigureNotify.

OK, thanks.

But I don't see anything like that on MS-Windows: we do have a call to
change_frame_size when we receive a WM_SIZE message, but running the
recipe in this thread doesn't cause WM_SIZE to be received, and the
call to change_frame_size, if it is done, comes via
internal-set-lisp-face-attribute and modify-frame-parameters,
i.e. directly from Lisp.  (When the frame is maximized,
change_frame_size is not called at all.)

Martin, can you tell what is the equivalent of the above X processing
on MS-Windows?  Does Emacs implement a similar logic internally?