Few more Polyline fixes

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

@@ -265,7 +265,7 @@ namespace ICSharpCode.WpfDesign.Designer.Extensions
 						points.Insert(mprt.Index, p);
 
 						//create adorner marker
-						CreateThumb(PlacementAlignment.BottomRight, Cursors.SizeNWSE, mprt.Index);
+						CreateThumb(PlacementAlignment.BottomRight, Cursors.Cross, mprt.Index);
 
 						//set index of all points that had a higher index than selected to +1
 						foreach (FrameworkElement rt in adornerPanel.Children)
@@ -333,7 +333,7 @@ namespace ICSharpCode.WpfDesign.Designer.Extensions
 			resizeThumbs = new List<ResizeThumb>();
 			for (int i = 1; i < points.Count; i++)
 			{
-				CreateThumb(PlacementAlignment.BottomRight, Cursors.SizeNWSE, i);
+				CreateThumb(PlacementAlignment.BottomRight, Cursors.Cross, i);
 			}
 
 			Invalidate();

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Project/Services/MouseGestureBase.cs

@@ -18,6 +18,7 @@
 
 using System;
 using System.Diagnostics;
+using System.Runtime.InteropServices;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Input;
@@ -149,7 +150,16 @@ namespace ICSharpCode.WpfDesign.Designer.Services
 		
 		static class MouseButtonHelper
 		{
-			private const long k_DoubleClickSpeed = 500;
+			[DllImport("user32.dll")]
+			static extern uint GetDoubleClickTime();
+			
+			static MouseButtonHelper()
+			{
+				k_DoubleClickSpeed = GetDoubleClickTime();
+			}
+			
+			private static readonly uint k_DoubleClickSpeed;
+			
 			private const double k_MaxMoveDistance = 10;
 			
 			private static long _LastClickTicks = 0;