4f9bf920b05fc0d30e873c0e0f9012b2fbde4bc3
try to add an observer more than once and we're not allowing duplicate observers so that existing callers to add() don't have the proverbial rug yanked out from underneath them. git-svn-id: https://samskivert.googlecode.com/svn/trunk@989 6335cc39-0255-0410-8fd6-9bcaacd3b74c
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Samskivert Library
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