(fix_submap_inheritance): Do nothing if the proper parent is an

ancestor of SUBMAP; otherwise, add it as the ultimate ancestor.

1 files changed, 17 insertions, 1 deletions

diff --git a/src/keymap.c b/src/keymap.c
index 1b673384806..c209a690226 100644
--- a/src/keymap.c
+++ b/src/keymap.c
@@ -426,7 +426,23 @@ fix_submap_inheritance (map, event, submap)
     parent_entry = Qnil;
 
   if (! EQ (parent_entry, submap))
-    Fset_keymap_parent (submap, parent_entry);
+    {
+      Lisp_Object submap_parent;
+      submap_parent = submap;
+      while (1)
+        {
+          Lisp_Object tem;
+          tem = Fkeymap_parent (submap_parent);
+          if (EQ (tem, parent_entry))
+            return;
+          if (CONSP (tem)
+              && EQ (XCONS (tem)->car, Qkeymap))
+            submap_parent = tem;
+          else
+            break;
+        }
+      Fset_keymap_parent (submap_parent, parent_entry);
+    }
 }
 
 /* Look up IDX in MAP.  IDX may be any sort of event.