Ensure listeners to Source objects are disconnected when data changes.
#4032
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In the
data/itemsetters of theDetailedList,Selection,TableandTreewidgets, this ensures that the implementation object is removed from the oldSource's listeners before the data is actually changed. This addresses the obvious issue raised in #4030 but does not fix the problem of disconnecting widgets when they are removed from the view.Ref #4030.
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