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

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

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

Message #10 received at 1458-done <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: Stephen Berman <stephen.berman <at> gmx.net>
Cc: 1458-done <at> debbugs.gnu.org
Subject: Re: 23.0.60; mouse-posn-property: Args out of range
Date: Sun, 30 Nov 2008 12:36:36 -0500

> 1. emacs -Q
>
> 2. Eval this:
>
>    (defun testme ()
>      (save-selected-window
>        (switch-to-buffer "testme")))
>
> 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

I've checked in a fix.  Thanks.

Message #15 received at 1458 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Chong Yidong  <cyd <at> stupidchicken.com>
Cc: 1458 <at> debbugs.gnu.org
Subject: Re: bug#1458: 23.0.60; mouse-posn-property: Args out of range
Date: Tue, 02 Dec 2008 10:11:39 -0500

You patch to timer_check doesn't seem right: it may cause the
current-buffer to be changed even if the timer doesn't do anything, just
because the current-buffer before running the timer wasn't the
selected-window's buffer.  It causes no end of trouble in Gnus
(e.g. when connecting to an IMAP server, it calls read-passwd during
which calls to read-event can run timers, so we start read-passwd in
the IMAP process's buffer and we finish it in the *Group* buffer or
which ever buffer is currently displayed, after which
send-process-string fails because it can't find the process).


        Stefan

Message #20 received at 1458 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 1458 <at> debbugs.gnu.org
Subject: Re: bug#1458: 23.0.60; mouse-posn-property: Args out of range
Date: Tue, 02 Dec 2008 11:39:11 -0500

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

> You patch to timer_check doesn't seem right: it may cause the
> current-buffer to be changed even if the timer doesn't do anything, just
> because the current-buffer before running the timer wasn't the
> selected-window's buffer.  It causes no end of trouble in Gnus
> (e.g. when connecting to an IMAP server, it calls read-passwd during
> which calls to read-event can run timers, so we start read-passwd in
> the IMAP process's buffer and we finish it in the *Group* buffer or
> which ever buffer is currently displayed, after which
> send-process-string fails because it can't find the process).

I see.  The change is reverted.

Now I'm not certain how to deal with the problem described in bug#1458.
Perhaps we should make the selected window's buffer current only if the
selected window's buffer was current before running the timer.  WDYT?

Message #25 received at 1458 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Chong Yidong <cyd <at> stupidchicken.com>
Cc: 1458 <at> debbugs.gnu.org
Subject: Re: bug#1458: 23.0.60; mouse-posn-property: Args out of range
Date: Tue, 02 Dec 2008 17:49:57 -0500

>> You patch to timer_check doesn't seem right: it may cause the
>> current-buffer to be changed even if the timer doesn't do anything, just
>> because the current-buffer before running the timer wasn't the
>> selected-window's buffer.  It causes no end of trouble in Gnus
>> (e.g. when connecting to an IMAP server, it calls read-passwd during
>> which calls to read-event can run timers, so we start read-passwd in
>> the IMAP process's buffer and we finish it in the *Group* buffer or
>> which ever buffer is currently displayed, after which
>> send-process-string fails because it can't find the process).

> I see.  The change is reverted.

> Now I'm not certain how to deal with the problem described in bug#1458.
> Perhaps we should make the selected window's buffer current only if the
> selected window's buffer was current before running the timer.  WDYT?

I don't think so.  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.


        Stefan

Message #32 received at 1458-done <at> emacsbugs.donarmstrong.com (full text, mbox):

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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