DynamoDS/Dynamo — pull request #2566 by Steell (2014-09-29 19:23:02+00:00)
Title: Fix for Selection nodes not remaining in sync with Document

@ikeough @lukechurch

Specifically, RequiresRecalc was getting set to true, which was triggering a re-execute, but was not causing the AST for the node to be re-executed due to a missing `ForceReExecuteAST = true`