Subject: 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

From: Robert Pluim <[email-masked]>
Date: Thu, 12 Aug 2021 09:48:18 +0200

>>>>> On Wed, 11 Aug 2021 20:38:18 +0300, Eli Zaretskii <[email-masked]> 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.

Robert
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