Add new command, "Open module".  You select or type a module name,
and it opens the source.
diff --git a/Tools/idle/Bindings.py b/Tools/idle/Bindings.py
index 4f833c6..795d837 100644
--- a/Tools/idle/Bindings.py
+++ b/Tools/idle/Bindings.py
@@ -57,6 +57,8 @@
      "<<open-new-window>>", "<Control-x><Control-n>"),
     ("file", "Open...", "C-x C-f",
      "<<open-window-from-file>>", "<Control-x><Control-f>"),
+    ("file", "Open module...", "C-x C-m",
+     "<<open-module>>", "<Control-x><Control-m>"),
     ("file", None, None),
 
     ("file", "Save", "C-x C-s",