Re: ***SPAM*** Re: (x-display-pixel-height)

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: emacs-devel@gnu.org
> Date: Sun, 22 May 2022 09:35:27 +0800
> 
> Hmm, I have a few questions: is it safe to assume the WM_DISPLAYCHANGE
> message will always be defined in the Windows headers Emacs is built
> with, and does it exist on Windows 9x?

Yes, see

  http://winapi.freetechsecrets.com/win32/WIN32WMDISPLAYCHANGE.htm

(which is IME an invaluable resource for finding information about API
support in old versions of Windows that Microsoft don't want us to
know about).

Of course, Windows 9X didn't support multiple monitors or PnP
monitors, so only resolution changes are relevant to those versions.
But I think w32-display-monitor-attributes-list already handles the
old versions gracefully.