bug#117: bug 117: messed up frame parameters

[Drew Adams]

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

Did you try on MS Windows?
The recipe and code I sent reproduces the problem, for me.

> 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.

Please see the test case I sent.

Duplication of frame parameters is only one of the symptoms mentioned, and it
might not even be responsible for the obvious, visual problems I reported.

See also bug #1562 (aka #119) - possibly it's related (dunno). For that bug, the
bug occurs in the C code of `modify-frame-parameters'.