bug#117: bug 117: messed up frame parameters

[Chong Yidong]

I can't reproduce this using the recipe you gave.

Please try to reduce the size of the test case.  One way to do this is
to define a function like this:

(defun check-frame-parameters ()
  (let (params (frame-parameters))
    (while params
      (if (assq (caar params) (cdr params))
        (error "Duplicate frame parameter found"))
      (setq params (cdr params)))))

and sprinkle (check-frame-parameters) throughout your code.  Then turn
on debug-on-error, and see when the error first appears.