GNU bug report logs - #1458
23.0.60; mouse-posn-property: Args out of range

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From: help-debbugs <at> gnu.org (Emacs bug Tracking System)
To: Chong Yidong <cyd <at> stupidchicken.com>
Subject: bug#1458: marked as done (23.0.60; mouse-posn-property: Args out 
 of range)

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Your message dated Tue, 02 Dec 2008 18:13:44 -0500
with message-id <87zlje41cn.fsf <at> cyd.mit.edu>
and subject line Re: bug#1458: 23.0.60; mouse-posn-property: Args out of range
has caused the Emacs bug report #1458,
regarding 23.0.60; mouse-posn-property: Args out of range
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
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immediately.)


-- 
1458: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=1458
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Contact help-debbugs <at> gnu.org with problems

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From: Stephen Berman <stephen.berman <at> gmx.net>
To: emacs-pretest-bug <at> gnu.org
Subject: 23.0.60; mouse-posn-property: Args out of range
Date: Sat, 29 Nov 2008 21:31:10 +0100

1. emacs -Q

2. Eval this:

   (defun testme ()
     (save-selected-window
       (switch-to-buffer "testme")))

If `testme' is not a fresh buffer, see observation (a) below.

3. Eval (run-at-time 3 nil 'testme) and wait 3 seconds.

4. When the `testme' buffer appears, move the mouse cursor over the mode line;
as soon as it hits a position that has a help-echo property containing the
string "mouse-2", the following error is raised:

   mouse-posn-property: Args out of range: 719

The out of range number is (point) in step 3.

Backtrace:

Debugger entered--Lisp error: (args-out-of-range 719)
  get-char-property(719 follow-link #<window 220 on testme>)
  mouse-posn-property((#<window 220 on testme> mode-line (467 . 644) 0 (#("-%-" 0 3 ...) . 2) 719 (58 . 46) nil (2 . 4) (8 . 16)) follow-link)
  (or (mouse-posn-property pos (quote follow-link)) (key-binding [follow-link] nil t pos))
  (and (or (not ...) mouse-1-click-in-non-selected-windows (eq ... ...)) (or (mouse-posn-property pos ...) (key-binding [follow-link] nil t pos)))
  (let ((action ...)) (cond (... ...) (... ...) (t action)))
  mouse-on-link-p((#<window 220 on testme> mode-line (467 . 644) 0 (#("-%-" 0 3 ...) . 2) 719 (58 . 46) nil (2 . 4) (8 . 16)))
  mouse-fixup-help-message("mouse-1: Select (drag to resize)\nmouse-2: Make current window occupy the whole frame\nmouse-3: Remove current window from display")


Observations:

a. The error only occurs when (point) of the the buffer that is current when
   step 3 is carried out, is greater than (point-max) of the buffer `testme'.
b. The error only occurs when testme is called from a timer.
c. The error only occurs when the function called from the timer
   contains a call to save-selected-window.
d. The error only occurs with propertized text satisfying mouse-on-link-p in
   either the mode line or the header line, i.e., suitably propertized
   text inserted into the editing area of the buffer does not induce the
   error.


In GNU Emacs 23.0.60.17 (i686-pc-linux-gnu, GTK+ Version 2.12.9)
 of 2008-11-29 on escher
Windowing system distributor `The X.Org Foundation', version 11.0.10400090
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=local
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

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From: Chong Yidong <cyd <at> stupidchicken.com>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 1458-done <at> debbugs.gnu.org
Subject: Re: bug#1458: 23.0.60; mouse-posn-property: Args out of range
Date: Tue, 02 Dec 2008 18:13:44 -0500

Stefan Monnier <monnier <at> IRO.UMontreal.CA> writes:

> I think we need to track this bug further down.  Maybe the problem is
> that some code uses current_buffer (maybe to build the mouse events?)
> rather than selected_window->buffer.

I've made a change to make_lispy_position that should solve this.

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