GNU bug report logs - #5557
<left-margin> <double-wheel-down> is undefined

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Kangas <stefan <at> marxist.se>
Cc: 5557 <at> debbugs.gnu.org, larsi <at> gnus.org, lennart.borgman <at> gmail.com
Subject: bug#5557: <left-margin> <double-wheel-down> is undefined
Date: Tue, 01 Oct 2019 21:31:58 +0300

> From: Stefan Kangas <stefan <at> marxist.se>
> Date: Tue, 1 Oct 2019 19:39:17 +0200
> Cc: Lars Ingebrigtsen <larsi <at> gnus.org>, 5557 <at> debbugs.gnu.org, 
> 	Lennart Borgman <lennart.borgman <at> gmail.com>
> 
> FWIW, I personally think it makes sense to add this binding also to
> the fringes and the scroll bar.  If the user tries to use the mouse
> wheel there, it's it my opinion most likely just a case of missing the
> window by a couple of pixels.

Maybe.  I'd like to hear more opinions, because we didn't have that
since Emacs 21 till now.

> > I'm guessing that the OP wanted to have the display scrolled no matter
> > where on display the user turns the mouse wheel, but evidently that's
> > not how things are defined by default.  If we decide to change that,
> > it IMO makes little sense to do that only for the margins, but not for
> > the fringes or the scroll bar.
> 
> I'm not seeing this when I use the mouse wheel on the scroll bar on
> GTK 3.  Instead, the "bar" (inside the scroll bar) that indicates the
> current position strangely moves downwards slowly.  I get no error
> message, and the window doesn't scroll.

That's because in your build these gestures on the scroll bar are
processed by GTK, not by Emacs.  Try some other toolkit, or maybe
no-toolkit, and you will see what I see.

But you do see what I described on the fringes, right?

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