Bugfix: previous container list wasn't cleared #55
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The equivalent c# for this section is
// First, find the previously open set of containers
if( _prevContainerSet == null ) _prevContainerSet = new HashSet ();
_prevContainerSet.Clear();
...with the if'd statement being there to avoid multiple allocations, but the Clear() being called every time. The JS was missing this clear, resulting in previous containers hanging around.