bug#8789: 23.3; debug backtrace buffer changes window on step-through

[martin rudalics]

> emacs -Q
>
> M-x load-file MARTIN-debug.elc
>
> M-x load-library files.el
>
> M-x debug-on-entry file-name-nondirectory
>
> C-x 4 f ; or something else, to enter the debugger
>
> In the debugger: hit `e' and enter `last-command', to evaluate that variable.
>
> I get this error:
>
> call-interactively: Wrong type argument: stringp, nil
>
> You should be able to evaluate a variable using `e' in the debugger.

My bad.  I inadvertently removed an assignment in `debug'.  Should work
now as before.  You can pick the change here:

http://bzr.savannah.gnu.org/lh/emacs/trunk/revision/110113

Thanks, martin