We use this bounds rect for querying the DisplayList rtree when culling.
But when sub-DisplayLists are being dispatched, the DisplayList's rtree
is local and doesn't incorporate parent layer filters. So
sub-DisplayLists are getting culled as if no filters are being applied.
Technically our local bounds tracking in Aiks is actually correct here,
but this is a quick fix to alleviate the problem. I don't know what the
best longterm solution for this is.
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