Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!THINK.COM!barmar
From: barmar@THINK.COM
Newsgroups: gnu.emacs.bug
Subject: Inferior Lisp mode conflicts with Shell mode
Message-ID: <8912040746.AA06448@leander.think.com>
Date: 4 Dec 89 07:46:44 GMT
Sender: daemon@tut.cis.ohio-state.edu
Distribution: gnu
Organization: GNUs Not Usenet
Lines: 17

In GNU Emacs 18.52.25...

Setting some key bindings in inferior-lisp-mode-map causes those same keys
to be bound in shell-mode-map.  It happens whenever you rebind a multi-key
sequence whose default value is copied from Shell mode (e.g. c-c c-z).

The cause is that inferior-lisp-mode-map is initialized to be (copy-alist
shell-mode-map).  This only copies two levels of the tree structure of the
sparse keymap.  The second-level alists, which are used for dispatching
after a prefix key, are shared by both keymaps.  When rebinding a key that
is already bound in the keymap the shared cons is RPLACDed, affecting both
keymaps.

Instead of using copy-alist, it should be using copy-keymap, so that all
levels of the keymap are copied.

						barmar


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