model.base: fix ConstrainedList.clear()
atomicity
#153
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The default inherited
clear()
implementation repeatedly deletes the last item of the list until the list is empty. If the last item can be deleted successfully, but an item in front of it that will be deleted later cannot, this makesclear()
non-atomic.Thus, the
clear()
method is now overriden in an atomic way. Furthermore, the ConstrainedList atomicity test is fixed to correctly test for this as well.