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When quoting a chat message in a post, if that message contains a mention, that mention should be ignored. But we've been detecting them and sending notifications to users. This PR fixes the problem. Since this fix is for the chat plugin, I had to introduce a new API for plugins: # We strip posts before detecting mentions, oneboxes, attachments etc. # We strip those elements that shouldn't be detected. For example, # a mention inside a quote should be ignored, so we strip it off. # Using this API plugins can register their own post strippers. def register_post_stripper(&block) end