bug#7520: 24.0.50; C-h k doesn't work for double-click bindings

[Drew Adams]

emacs -Q
 
(defun foo (event)
 (interactive "e")
 (message "FOOOOOOOO"))
 
(global-set-key [double-mouse-3] 'foo)
 
`C-h k', then double-click mouse-3.
 
The double-click event is not handled by C-h k.  The doc you see is
for the command bound to `mouse-3', not the command bound to
`double-mouse-3'.

In GNU Emacs 24.0.50.1 (i386-mingw-nt5.1.2600)
 of 2010-11-30 on 3249CTO
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.4) --no-opt --cflags
-Ic:/imagesupport/include'