GNU bug report logs - #57349
29.0.50; pixel-scroll-precision-mode. error integer-or-marker-p nil

Previous Next

Full log

View this message in rfc822 format

From: Eli Zaretskii <eliz <at> gnu.org>
To: Gerd Möllmann <gerd.moellmann <at> gmail.com>
Cc: 57349 <at> debbugs.gnu.org
Subject: bug#57349: 29.0.50; pixel-scroll-precision-mode. error integer-or-marker-p nil
Date: Tue, 23 Aug 2022 14:57:29 +0300

> From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
> Date: Tue, 23 Aug 2022 08:12:54 +0200
> 
> emacs -Q
> M-x pixel-scroll-precision-mode RET
> 
> Move the mouse to the lower right corner of the Emacs frame.  On macOS,
> the mouse cursor changes shape to a double-arrow pointing 45 degrees in
> the direction of the upper-left and lower-right corner of the screen.
> 
> Scroll the mouse wheel.
> 
> This either prints messages like this
> 
> <nil> <wheel-up> is undefined
> <nil> <double-wheel-up> is undefined
> <nil> <triple-wheel-up> is undefined [45 times]
> <nil> <wheel-down> is undefined

It may surprise this, but why do you think this is a problem?  How is
it different from what happens if you do this, for example:

  C-M-<F10>

(assuming that sequence is not bound to some command)?

> or sometimes errors 'Wrong type argument: integer-or-marker-p, nil'.

This shouldn't happen, indeed.

> Not sure what to make of this.  Looks like posn-at-x-y returns a posn
> with a nil point?  Or maybe posn-point returns nil?

Either this should be fixed, or the code should be prepared for nil in
this case.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.