Depends really if the same code has just been rewritten and updated, or if the idea has simply come around again and the code is completely different. It could be a genuine mistake, and the coder simply didn't know that you had written something similar for vBulletin 3.0.x.
Personally, I generally don't believe in coders owning an idea. They do however own the code written for that idea.. However, credit should still be given where it is due.
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