Re: lispref/frames.texi and xmenu.c

[Richard Stallman]

    My text assumes that in situations where `x-popup-dialog' has to
    actually use a menu instead of a dialog box, doing

    M-: (x-popup-dialog (read-event) '("PANE" ("LINE1" . 1)))

    then clicking the mouse to make the menu pop up and then getting rid
    of that menu without making a valid choice actually returns nil
    without quitting.

I think that assumption is not true.  From reading the code,
x-popup-dialog ALWAYS quits if the user doesn't make a valid choice.