[rules-users] Getting fix for JBRULES-2375

Hi All, I'm working with Drools Fusion and have run into the deadlock issue in https://jira.jboss.org/browse/JBRULES-2375 (Drools hangs when events are retracted).  This bug indicates it is fixed in 5.1.0.CR1.  How can I get this fix, or alternatively, where in the SVN repository can I look at the code fix so I can create a custom version of 5.0.1 with this fix? Thanks in advance for your help. Norman