Comment 8 for bug 937792

I don't think there is a formal rule about it. Generally I dupe to whichever one has the better information. Sometimes the newer bug is better since it's tested against more recent bits, or because the reporter is more active, or something. All else being equal I'll default to the chronologically first, but really the only rule of thumb is do whatever is most likely to get the bug solved soonest. :-)