bug#49803: 27.2; Mouse wheel on MacOS is reported as mouse-4 and mouse-5, but Emacs mwheel seems to use wheel-up/wheel-down instead

[Eli Zaretskii]

> From: Robert Pluim <rpluim@gmail.com>
> Cc: didibus@gmail.com,  49803@debbugs.gnu.org
> Date: Thu, 12 Aug 2021 09:48:18 +0200
> 
> >>>>> On Wed, 11 Aug 2021 20:38:18 +0300, Eli Zaretskii <eliz@gnu.org> said:
>     >> +(defcustom xterm-mouse-map-buttons
>     >> +  (if (featurep 'ns-win)
>     >> +      t
>     >> +    nil)
>     >> +  "Non-nil if xterm should perfom mouse button mappings.
>     >> +Will use `xterm-mouse-map-buttons-alist' for the mapping.
>     >> +Defaults to t when using macOS for consistency with 'mwheel'."
>     >> +  :type 'boolean
>     >> +  :version "28.1"
>     >> +  :group 'xterm)
> 
>     Eli> So you are saying that by moving this from mwheel.el, we avoid the
>     Eli> danger of using the wrong mapping on TTY frames on macOS?
> 
> With the caveat that weʼre not moving anything from mwheel, but rather
> adapting xt-mouse to mwheel's expectations, yes. I think thatʼs a
> better idea than adapting mwheel to have frame-specific values for
> mouse-wheel-{up,down}-event.

I think you are right, assuming that xt-mouse is the only way macOS
terminals can support a mouse.