Fix handling of changed prefix keys in tutorial

* lisp/tutorial.el (tutorial--find-changed-keys): Use keymapp to
detect prefix definitions rather than hard-coding them.  A notable
omission from the hard-coded list was mode-specific-command-prefix,
whose subcommands are often rebound (bug#40725).

diff --git a/lisp/tutorial.el b/lisp/tutorial.el
index 186bf35fe7e9c0a1ea4bf3ab06ff2069013fa88d..bf985280d80a876c391da96ada13d97f3ef2ba14 100644 (file)
--- a/lisp/tutorial.el
+++ b/lisp/tutorial.el
@@ -423,11 +423,9 @@ where
               ;; Handle prefix definitions specially
               ;; so that a mode that rebinds some subcommands
               ;; won't make it appear that the whole prefix is gone.
-              (key-fun (if (eq def-fun 'ESC-prefix)
-                           (lookup-key global-map [27])
-                         (if (eq def-fun 'Control-X-prefix)
-                             (lookup-key global-map [24])
-                           (key-binding key))))
+               (key-fun (if (keymapp def-fun)
+                            (lookup-key global-map key)
+                          (key-binding key)))
               (where (where-is-internal (if rem-fun rem-fun def-fun)))
               cwhere)