bug#7476: 24.0.50; tooltip-mode disabled interferes with x-popup-menu prompts

["Drew Adams" <drew.adams@oracle.com>]

emacs -Q

1. Eval this:

(defun foo (event)
  "..."
  (interactive "e")
  (sit-for 0)
  (let ((selection
	 (x-popup-menu
	  event
	  '("Foo" (""
		   ("Bar" . ignore)
		   ("Toto" . picture-clear-rectangle-to-register))))))
    (and selection (call-interactively selection))))

(global-set-key [mouse-3] 'foo)

2. M-x picture-mode

3. Click mouse-1 somewhere then mouse-3 somewhere else.
Choose Toto in the menu.

You will see the `read-char' prompt from
`picture-clear-rectangle-to-register' in the minibuffer:

  Rectangle to register:

This is all as it should be.

4. Now disable tooltip mode:
M-x tooltip-mode

5. Repeat #3.  The prompt is not shown.
Instead, the mouse keystrokes are echoed.
(Setting `echo-keystrokes' to nil does not help.)

Emacs should show the prompt.

In GNU Emacs 24.0.50.1 (i386-mingw-nt5.1.2600)
 of 2010-11-22 on 3249CTO
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.4) --no-opt --cflags
-Ic:/imagesupport/include'