[slime-devel] undo-in-progress + XEmacs?

[Friedrich Dominicus]

Well I'm wondering if anyone has encountered any trouble with that
variable also. The only place it is used is around line
2876 in slime.el, it's nowhere defined and well Xemcs gives up on it
and simply hangs I addes this:

;; no where defined?
(setq undo-in-progress nil)

above 
slime-after-change-function

and now slime starts again. 

Regards
Friedrich