GNU bug report logs - #68698
30.0.50; Making xt-mouse emit `wheel-up/down`

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From: Po Lu <luangruo <at> yahoo.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 68698 <at> debbugs.gnu.org
Subject: bug#68698: 30.0.50; Making xt-mouse emit `wheel-up/down`
Date: Thu, 25 Jan 2024 10:25:53 +0800

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

> The second step would be to do something similar for the non-XInput2 X11
> build: make it generate `wheel-up/down` events according to
> `mouse-wheel-down/up-event` settings.  Then packages like
> `completion-preview` and `mwheel` won't need to pay attention to the
> (confusingly named) `mouse-wheel-down/up-event` vars any more.

No!

Button4, 5, 6 and 7 are only mouse wheels in one particular group of X
servers.  It is impossible to detect whether they are mouse wheels
without the input extension (and this is why XI display connections
produce wheel events), so such an escape hatch as mouse-wheel-*-event
_must_ be provided for X servers where the general assumption that they
are mouse wheels does not hold true.

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