diff -r e5d963cb6afc Lib/turtle.py
--- a/Lib/turtle.py	Sat May 24 00:32:29 2014 +0200
+++ b/Lib/turtle.py	Fri Jun 20 15:58:41 2014 -0700
@@ -27,10 +27,11 @@
 kids. It was part of the original Logo programming language developed
 by Wally Feurzig and Seymour Papert in 1966.
 
-Imagine a robotic turtle starting at (0, 0) in the x-y plane. After an ``import turtle``, give it
-the command turtle.forward(15), and it moves (on-screen!) 15 pixels in
-the direction it is facing, drawing a line as it moves. Give it the
-command turtle.right(25), and it rotates in-place 25 degrees clockwise.
+Imagine a robotic turtle starting at (0, 0) in the x-y plane. After an
+``import turtle``, give it the command turtle.forward(15), and it moves
+(on-screen!) 15 pixels in the direction it is facing, drawing a line as it
+moves. Give it the command turtle.right(25), and it rotates in-place 25
+degrees clockwise.
 
 By combining together these and similar commands, intricate shapes and
 pictures can easily be drawn.
@@ -122,21 +123,21 @@
         'getshapes', 'listen', 'mainloop', 'mode', 'numinput',
         'onkey', 'onkeypress', 'onkeyrelease', 'onscreenclick', 'ontimer',
         'register_shape', 'resetscreen', 'screensize', 'setup',
-        'setworldcoordinates', 'textinput', 'title', 'tracer', 'turtles', 'update',
-        'window_height', 'window_width']
+        'setworldcoordinates', 'textinput', 'title', 'tracer', 'turtles',
+        'update', 'window_height', 'window_width']
 _tg_turtle_functions = ['back', 'backward', 'begin_fill', 'begin_poly', 'bk',
         'circle', 'clear', 'clearstamp', 'clearstamps', 'clone', 'color',
         'degrees', 'distance', 'dot', 'down', 'end_fill', 'end_poly', 'fd',
-        'fillcolor', 'filling', 'forward', 'get_poly', 'getpen', 'getscreen', 'get_shapepoly',
-        'getturtle', 'goto', 'heading', 'hideturtle', 'home', 'ht', 'isdown',
-        'isvisible', 'left', 'lt', 'onclick', 'ondrag', 'onrelease', 'pd',
-        'pen', 'pencolor', 'pendown', 'pensize', 'penup', 'pos', 'position',
-        'pu', 'radians', 'right', 'reset', 'resizemode', 'rt',
-        'seth', 'setheading', 'setpos', 'setposition', 'settiltangle',
-        'setundobuffer', 'setx', 'sety', 'shape', 'shapesize', 'shapetransform', 'shearfactor', 'showturtle',
-        'speed', 'st', 'stamp', 'tilt', 'tiltangle', 'towards',
-        'turtlesize', 'undo', 'undobufferentries', 'up', 'width',
-        'write', 'xcor', 'ycor']
+        'fillcolor', 'filling', 'forward', 'get_poly', 'getpen', 'getscreen',
+        'get_shapepoly', 'getturtle', 'goto', 'heading', 'hideturtle', 'home',
+        'ht', 'isdown', 'isvisible', 'left', 'lt', 'onclick', 'ondrag',
+        'onrelease', 'pd', 'pen', 'pencolor', 'pendown', 'pensize', 'penup',
+        'pos', 'position', 'pu', 'radians', 'right', 'reset', 'resizemode',
+        'rt', 'seth', 'setheading', 'setpos', 'setposition', 'settiltangle',
+        'setundobuffer', 'setx', 'sety', 'shape', 'shapesize', 'shapetransform',
+        'shearfactor', 'showturtle', 'speed', 'st', 'stamp', 'tilt',
+        'tiltangle', 'towards', 'turtlesize', 'undo', 'undobufferentries',
+        'up', 'width', 'write', 'xcor', 'ycor']
 _tg_utilities = ['write_docstringdict', 'done']
 
 __all__ = (_tg_classes + _tg_screen_functions + _tg_turtle_functions +
@@ -2936,17 +2937,17 @@
         if t21 is not None: m21 = t21
         if t22 is not None: m22 = t22
         if t11 * t22 - t12 * t21 == 0:
-            raise TurtleGraphicsError("Bad shape transform matrix: must not be singular")
+            raise TurtleGraphicsError(("Bad shape transform matrix:"
+                                       "must not be singular"))
         self._shapetrafo = (m11, m12, m21, m22)
         alfa = math.atan2(-m21, m11) % (2 * math.pi)
         sa, ca = math.sin(alfa), math.cos(alfa)
         a11, a12, a21, a22 = (ca*m11 - sa*m21, ca*m12 - sa*m22,
                               sa*m11 + ca*m21, sa*m12 + ca*m22)
         self._stretchfactor = a11, a22
-        self._shearfactor = a12/a22
+        self._shearfactor  = a12/a22
         self._tilt = alfa
-        self._update()
-
+        self.pen(resizemode="user")
 
     def _polytrafo(self, poly):
         """Computes transformed polygon shapes from a shape