private void DockPositionPropertyChanged(object sender, DependencyPropertyChangedEventArgs e)
{
Debug.Assert(!IsIdle);
if (e.OldValue != e.NewValue && sender is DockableCollection dockableCollection && InternalChildren.Contains(dockableCollection))
{
LayoutContext layoutContext = GetLayoutContext(dockableCollection);
if (layoutContext != null)
{
// A likely scenario is the collection was created, added to the Dock's Items collection, then
// the attached DockPosition property was set. We may or may not, have already arranged the
// element.
//
// A less likely scenario is the user simply set DockPosition to a new value for whatever reason.
layoutContext.Remove();
InsertByDockPosition(layoutContext);
layoutContext.InvalidatePositioning(LayoutContext.PositionClasses.All);
InvalidateArrange();
}
}
}
