bug#7691: 24.0.50; x-popup-menu with keymap - :help keyword

[Drew Adams]

> IIRC it is not possible to display tooltips while popup menus are
> displayed on Windows, as creating the tooltip involves 
> Windows messages to the same thread that the popup menu is
> blocking.

Poor Windows. ;-)

Does this work OK on other platforms?
IOW, is the bug itself Windows-specific?

> But the help message should be displayed in the minibuffer.

Yes, that would be OK.

Would this (fixed) behavior be Windows-specific?

Should this behavior be mentioned in the `x-popup-menu' doc?  If not, someone
might well report a bug saying that the code doesn't respect `tooltip-mode'
(since it always puts the help in the minibuffer).