bug#11141: 24.0.94; crash with `x-popup-dialog'

[Chong Yidong]

"Drew Adams" <drew.adams@oracle.com> writes:

> 100% reproducible, from emacs -Q.
>  
> (defun titi (event)
>   (interactive "e")
>   (let ((choice (x-popup-dialog
>                  event
>                  '("ABC"
>                    "DEF"
>                    ("OK" . bar)))))
>     (and choice (call-interactively choice))))
>  
> (defun bar () (interactive) t)
>  
> (global-set-key [double-mouse-2] 'titi)
> (global-set-key [mouse-2] nil)
>  
> Then double-click mouse-2.  Note that if you remove the string "DEF"
> there is no crash.

No crash on latest trunk, x86_64-unknown-linux-gnu.  Maybe a Windows
issue.  Any backtrace?