bug#65360: emacs 29.1 with MSYS2: vertical scrolling with touchpad not working

[Vincent Torri <vincent.torri@gmail.com>]

On Fri, Aug 18, 2023 at 8:28 AM Eli Zaretskii <eliz@gnu.org> wrote:
>
> > From: Vincent Torri <vincent.torri@gmail.com>
> > Date: Fri, 18 Aug 2023 07:51:45 +0200
> > Cc: 65360@debbugs.gnu.org
> >
> > >  Unfortunately, we don't currently have
> > > anyone with access to such a machine who could debug the relevant code
> > > and tell what is wrong with it.  If you can run Emacs under GDB on
> > > that machine and report some findings (I can provide more detailed
> > > instructions), we might be able to fix this.
> >
> > I can do that, tell me what to do
>
> Thank you.
>
> The relevant code is in w32term.c:w32_construct_mouse_wheel.

ok

>  For
> starters, could you please step through that function and tell what
> you see when you scroll with the touchpad?  In particular, does the
> value of 'delta' become positive or negative depending on the
> direction of the scrolling?  Also, what are the computed values of p.x
> and p.y, and what are the values in the structure pointer to by
> 'result' immediately before the function returns?
>
> Note: to be able to show values of Lisp objects, you need to tell GDB
> to read the src/.gdbinit file in the Emacs source tree:
>
>   (gdb) source /path/to/emacs/src/.gdbinit
>
> P.S. It goes without saying that you will need to have the sources of
> Emacs 29.1 available, if you don't already.

maybe it will be simpler for me to compile emacs and debug it directly
with some printf(). At least i know where to look at now

Vincent