* slime-tests.el (read-from-minibuffer): New test.
Fix bug in slime-complete-restore-window-configuration.

* slime.el (slime-complete-restore-window-configuration): Don't
use a timer.  That was only needed for XEmacs and it was
accidentally started multiple times.
* slime-tests.el (read-from-minibuffer): Fix for Emacs 23.