[#] IMPORTANT: ObserverWidget::observerContext() return value changed in
tree mode. Previously, this function
	    returned the selection parent observer context in tree
view mode when there was a selection. This is wrong,
		it should return the root observer context as the
selection parent context is available through
		ObserverWidget::selectionParent() already and
observerContext() should be consistent between TableView and
        TreeView modes. If you used observerContext() to get hold of the
parent selection, please make the
        necessary changes to use selectionParent() instead.