Commits on Jun 21, 2023

1. chain: remove redundant Add(tx) in zmq event …

   This commit removes adding tx to mempool when received from `rawtx` zmq
   to prevent the same tx gets to be added multiple times since it will be
   notified multiple times. This also means we need to send the new tx in
   `mempoolPoller` to make sure the subscriber won't miss the event.
   
   The two good cases,
   1. subscribe the input, `LookupInputSpend` return false
   2. tx seen by `rawtx` or mempool poller
   3. notified in `filterTx`
   
   1. tx seen by `rawtx` or mempool poller
   2. subscribe the input
   3. will be notified via `LookupInputSpend`
   
   The bad case is,
   1. sent by `rawtx`, which marks the tx as seen in `filterTx`
   2. subscribe the input, `LoopupInputSpend` return false
   3. sent by the mempool poller, `filterTx` will ignore this tx, thus the
      subscriber won't be notified

   

   yyforyongyu committed Jun 21, 2023
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