this is my current cvs diff of slime (so, this patch makes my previous mails obsolete).
2006-11-04 Attila Lendvai attila.lendvai@gmail.com
* slime.el (slime-repl-kill-input): Also reset the history navigation and when point is right after the prompt then delete the entire repl input. (slime-repl-delete-from-input-history): New. Deletes the current repl input from the history after merging it with the saved version, then overwrite the saved history, so it will not be re-added when normally saving the repl history. Bound to "\M-\C-d" by default. (slime-repl-merge-histories): Use a hashtable for uniqueness check. (sldb-sexp-highlight-mode): Fix for GNU Emacs not having 'paren-mode. (slime-repl-previous-input-starting-with-current-input): Revive old M-p behaviour in the repl due to #lisp demand. Two other ways to navigate the history is M-up to move a single position and M-r to search for a regexp, M-r again to search for the last regexp. Display the current regexp in various minibuffer messages.