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Drag and Drop a LayoutAnchorable exception

description

When drag and drop a LayoutAnchorable from a side to the other side an object null exception had been threw.

Suggest to fix this issue is add 1 more null check to Xceed.Wpf.AvalonDock.Controls.DropTarget<T> method public void Drop(LayoutFloatingWindow floatingWindow) as below


Dispatcher.BeginInvoke(new Action(() =>
            {
                if (currentActiveContent == null) return;
               currentActiveContent.IsSelected = false;
                currentActiveContent.IsActive = false;
                currentActiveContent.IsActive = true;
            }), DispatcherPriority.Background);

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