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.
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