>  > The general approach sounds good, but we should probably try to refine
 >  > it so as to minimize changes in behavior, and so it works right in the
 >  > multi-frame and even multi-terminal case.
 >  >
 >  > We could try to store the last-used-window in a variable
 >  > `debugger-last-used-window' and use that window after checking that it's
 >  > still live and is visible in the selected terminal.

OK.  Attached find my last ;-) stab at this.

martin