Normalizes the cell union by discarding cells that are contained by other
cells, replacing groups of 4 child cells by their parent cell whenever
possible, and sorting all the cell ids in increasing order.
Returns true if the number of cells was reduced.
TODO(ericv): Change this method to return void.
Normalizes the cell union by discarding cells that are contained by other cells, replacing groups of 4 child cells by their parent cell whenever possible, and sorting all the cell ids in increasing order.
Returns true if the number of cells was reduced. TODO(ericv): Change this method to return void.