Item8611: A COMMENT gets applied again when a save is invoked from an afterSaveHandler

COMMENT uses the beforeSaveHandler to re-read the topic and insert the comment. It gets the comment from the URL params. But if we have the scenario where another plugin has an afterSaveHandler which saves a different topic, then the beforeSaveHandler in the CommentPlugin will end up inserting the comment again.

The workaround is for the calling plugin to ensure that any URL params are removed from the request before saving any further topics. The fix is for CommentPlugin to remove those same params after it has processed them once.

-- CrawfordCurrie - 24 Feb 2010

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