A few fixes on the Geometry Extensions

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Project/Extensions/DrawPathExtension.cs

@@ -134,6 +134,7 @@ namespace ICSharpCode.WpfDesign.Designer.Extensions
 			{
 				base.OnMouseDoubleClick(sender, e);
 				
+				figure.Segments.RemoveAt(figure.Segments.Count - 1);
 				geometry.Properties[PathGeometry.FiguresProperty].SetValue(figure.ToString());
 				
 				if (changeGroup != null) {

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Project/Extensions/PointTrackerPlacementSupport.cs

@@ -66,17 +66,11 @@ namespace ICSharpCode.WpfDesign.Designer.Extensions
 				}
 				p = new Point(x, y);
 			} else if (shape is Polygon) {
-				if (Index > 0)
-				{
 					var pg = shape as Polygon;
 					p = pg.Points[Index];
-				}
 			} else if (shape is Polyline) {
-				if (Index > 0)
-				{
-					var pg = shape as Polyline;
-					p = pg.Points[Index];
-				}
+				var pg = shape as Polyline;
+				p = pg.Points[Index];
 			} else if (shape is Path) {
 				if (Index > 0)
 				{

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Project/Extensions/PolyLineHandlerExtension.cs

@@ -157,27 +157,6 @@ namespace ICSharpCode.WpfDesign.Designer.Extensions
 			_isResizing = true;
 		}
 
-		void ChangeOperation(PointCollection points)
-		{
-			//this is for SharpDevelop built in undo functionality
-			if (operation != null)
-			{
-				var info = operation.PlacedItems[0];
-				var result = info.OriginalBounds;
-
-				IEnumerable<double> xs = points.Select(x => x.X);
-				IEnumerable<double> ys = points.Select(y => y.Y);
-				result.X = (double)(info.Item.Properties.GetAttachedProperty(Canvas.LeftProperty).ValueOnInstance);
-				result.Y = (double)(info.Item.Properties.GetAttachedProperty(Canvas.TopProperty).ValueOnInstance);
-				result.Width = xs.Max() - xs.Min();
-				result.Height = ys.Max() - ys.Min();
-
-				info.Bounds = result.Round();
-				operation.CurrentContainerBehavior.BeforeSetPosition(operation);
-				operation.CurrentContainerBehavior.SetPosition(info);
-			}
-		}
-
 		void CommitOperation()
 		{
 			if (operation != null)
@@ -298,7 +277,7 @@ namespace ICSharpCode.WpfDesign.Designer.Extensions
 				points = MovePoints(points, dx, dy, theta, snapAngle);
 
 			}
-			ChangeOperation(points);
+			
 			(drag.Target as ResizeThumb).InvalidateArrange();
 		}
 
@@ -415,7 +394,6 @@ namespace ICSharpCode.WpfDesign.Designer.Extensions
 			var dx2 = (e.Key == Key.Right) ? Keyboard.IsKeyDown(Key.LeftShift) ? _movingDistance + 10 : _movingDistance + 1 : 0;
 			var dy2 = (e.Key == Key.Down) ? Keyboard.IsKeyDown(Key.LeftShift) ? _movingDistance + 10 : _movingDistance + 1 : 0;
 
-			ChangeOperation(MovePoints(GetPointCollection(), dx1 + dx2, dy1 + dy2, 0, null));
 			_movingDistance = (dx1 + dx2 + dy1 + dy2);
 		}