===Python API===

Three more changes for the Mesh module:
(1) Bug fix for UV vertices ("sticky").  me->msticky was not being updated
   when vertices were added or deleted from the mesh.
(2) Vertex, edge and face .extend() methods accept zero-length sequences
   instead of throwing an exception.  (Note that not giving any argument
   is still an error).
(3) Edge and face .extend() methods ignore "invalid" edges or faces which
   have the same vertex twice instead of throwing an exception.  Cam and I
   argued about this for a while... :-)

Ken

source/blender/python/api2_2x/doc/Mesh.py

@@ -258,7 +258,7 @@ class MVertSeq:
 
   def extend(coords):
     """
-    Append one or more vertices to the mesh.  Unlike L{MEdgeSeq.extend()} and
+    Append zero or more vertices to the mesh.  Unlike L{MEdgeSeq.extend()} and
     L{MFaceSeq.extend()} no attempt is made to check for duplicate vertices in
     the parameter list, or for vertices already in the mesh.
 
@@ -334,10 +334,10 @@ class MEdgeSeq:
 
   def extend(vertseq):
     """
-    Add one or more edges to the mesh.  Edges which already exist in the 
-    mesh are ignored.  If three or four verts are specified in any tuple,
-    an edge is also created between the first and last vertices (this is
-    useful when adding faces).
+    Add zero or more edges to the mesh.  Edges which already exist in the 
+    mesh or with both vertices the same are ignored.  If three or four verts
+    are specified in any sequence, an edge is also created between the first
+    and last vertices (this is useful when adding faces).  
 
     Example::
       import Blender
@@ -523,9 +523,10 @@ class MFaceSeq:
 
   def extend(vertseq):
     """
-    Add one or more faces to the mesh.  Faces which already exist in the 
-    mesh are ignored.  Sequences of two vertices are accepted, but no face
-    will be created.
+    Add zero or more faces and edges to the mesh.  Faces which already exist
+    in the mesh, or faces which contain the same vertex multiple times are
+    ignored.  Sequences of two vertices are accepted, but no face will be
+    created.
 
     Example::
       import Blender