Fix deserialized layout document close. #404
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Recently I mentioned that
LayoutElement._rootdoesn't have correct value after deserialization. When we deserialize layout from xml enclosing element is not finished with yet and therefore doesn't have correct parent yet.This state prevents
LayoutRoot.ElementRemovedfrom being called on close, which leads to skipped call toDockingManager.CollectLayoutItemsDeleted.Also I mentioned that documents closed via deletion from
DockingManager.DocumentsSourcedid not have theirContentproperty set to null. Though we do it forAnchorablesSourceand inExecuteCloseCommand, so I added it.