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When a rebuild is performed on an index that already exists, the index is scanned to check for resources. This scan has been changed from reading the entire index file to following the resource chain and saving the resources into a temporary file, then recreating the index file and adding the resources to the new index file (as is done by the file compact function). This speeds up the index scan and it can reduce the size of the index file if many unused nodes exist in the original index file.
