Additional Null-Check in TransformToDeviceDPI #462
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Avoid the following NullException:
TransformExtensions TransformToDeviceDPI: First Chance Exception: System.NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
bei AvalonDock.Controls.TransformExtensions.TransformToDeviceDPI(Visual visual, Point pt)
bei AvalonDock.DockingManager.AvalonDock.Controls.IOverlayWindowHost.HitTestScreen(Point dragPoint)
bei AvalonDock.Controls.DragService.<>c__DisplayClass9_0.b__0(IOverlayWindowHost oh)
bei System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable
1 source, Func2 predicate)bei AvalonDock.Controls.DragService.UpdateMouseLocation(Point dragPosition)
bei AvalonDock.Controls.LayoutFloatingWindowControl.UpdateDragPosition()
bei AvalonDock.Controls.LayoutFloatingWindowControl.FilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
bei AvalonDock.Controls.LayoutAnchorableFloatingWindowControl.FilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
bei System.Windows.Interop.HwndSource.PublicHooksFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
bei MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
bei MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
bei System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
bei System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)