23.0.60; Image in before-string of overlay interferes with keymap

[Ralf Angeli <angeli@caeruleus.net>]

As soon as an image is used in the before-string property of an overlay,
mouse clicks as defined in a keymap for the propertized string are not
recognized anymore.

In order to reproduce this, start Emacs with `emacs -Q', execute the
code snippet included below and click with mouse-1, mouse-2 or mouse-3
on the image in the new buffer.  If the `display' property is omitted
from the code below, clicking on the letter "A" after executing the code
will show "Mouse-1", "Mouse-2" or "Mouse-3" in the echo area, depending
on which mouse button was used when clicking on it.


(progn
  (pop-to-buffer "*foo*")
  (insert "xxx")
  (let ((ov (make-overlay 1 4))
	(map (make-sparse-keymap)))
    (define-key map [mouse-1] (lambda () (interactive) (message "Mouse-1")))
    (define-key map [mouse-2] (lambda () (interactive) (message "Mouse-2")))
    (define-key map [mouse-3] (lambda () (interactive) (message "Mouse-3")))
    (overlay-put ov 'before-string
		 (propertize
		  "A"
		  'keymap map
		  'display `(image :type xpm
				   :file ,(concat data-directory
						  "/images/attach.xpm"))
		  'mouse-face 'highlight))))



In GNU Emacs 23.0.60.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.12.7)
 of 2008-02-06 on photon
Windowing system distributor `The X.Org Foundation', version 11.0.10400090
configured using `configure  '--enable-font-backend''

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: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-compression-mode: t
  line-number-mode: t

Recent input:
<mouse-1> <down-mouse-2> <mouse-2> C-_ <down-mouse-3> 
<mouse-3> C-x o C-p C-p C-p C-p C-f C-SPC C-n C-n C-n 
C-p C-p C-p C-SPC C-SPC C-n C-n C-n M-; C-x 0 C-x k 
<return> C-n C-b C-x C-e <down-mouse-1> <mouse-1> <down-mouse-2> 
<mouse-2> <down-mouse-3> <mouse-3> C-x 1 M-x r e p 
o r t - e m <tab> <return> C-g C-x k <return> C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p 
C-a C-SPC C-SPC C-n C-n C-n C-n M-w M-> <return> C-y 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p 
C-p C-p C-p C-n C-n C-n C-n C-n C-n C-p C-p C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-SPC C-SPC C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
M-w <return> C-y C-k C-k C-k C-k C-k C-k C-k C-k C-k 
C-k C-p C-p C-p C-p C-p C-p C-p C-b <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> d i s p l a y C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-b C-x C-e <down-mouse-1> 
<mouse-1> <down-mouse-2> <mouse-2> <down-mouse-3> <mouse-3> 
C-x k <return> C-x 0 C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-SPC C-SPC C-n C-n C-n M-; C-n C-n C-b C-x C-e <down-mouse-2> 
<mouse-2> C-x k <return> C-x 0 C-n C-n C-n C-n C-n 
C-n C-n C-n C-SPC M-> C-SPC C-SPC C-p C-p C-p C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-w 
C-p C-p C-p C-p C-SPC C-SPC C-n C-n C-n M-; M-< C-SPC 
C-M-f M-w M-x r e p o r t - e m a <tab> <return>

Recent messages:
Mouse-3
Mark set
Transient-mark-mode temporarily enabled
#("A" 0 1 (mouse-face highlight display (image :type xpm :file "/usr/src/emacs/etc//images/attach.xpm") keymap (keymap (mouse-3 lambda nil ... ...) (mouse-2 lambda nil ... ...) (mouse-1 lambda nil ... ...))))
Mouse-2
Mark set [3 times]
Transient-mark-mode temporarily enabled
Mark set
Transient-mark-mode temporarily enabled
Mark set [2 times]

-- 
Ralf