Friedrich Dominicus frido@q-software-solutions.de writes:
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
Thanks for the report. undo-in-progress seems to be an Emacs-specific variable; I have now installed a work-around for XEmacs in SLIME CVS.
Regards