bug#9366: Display geometry change hook

[David De La Harpe Golden]

On 25/08/11 06:55, Eli Zaretskii wrote:
> > Date: Thu, 25 Aug 2011 06:16:58 +0100
> > From: David De La Harpe Golden<david@harpegolden.net>
> >
> > Dunno about w32 as yet, but presumably it has something similar.
>
> On MS-Windows there's the WM_DISPLAYCHANGE message sent to the message
> pump.  Emacs already accepts that message (see w32term.c), but
> currently does nothing with it except announcing the change to the
> attached debugger.
>
> However, on Windows the message also specifies the new resolution, so
> this:

Technically the incoming x11 event does too, but as you can re-query 
with the existing #'display-pixel-width etc. functions (and get the new 
values) anyway by the time the hook actually runs (on x11), wasn't sure 
we needed to allow for propagation of the info really.