Make one-off Callbacks ready for deletion after the prerun step.
Waiting until the actual run step means that the handler is not marked for deletion when checked in the __spawn_event() thread, causing the callback to stay in the handler list.
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@ -62,6 +62,8 @@ class Callback(BaseHandler):
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payload -- The matched stanza object.
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"""
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BaseHandler.prerun(self, payload)
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if self._once:
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self._destroy = True
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if self._instream:
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self.run(payload, True)
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