Problem: The mempool memory estimate omits the txid set used to retry the initial broadcast of locally submitted transactions, so getmempoolinfo and -maxmempool undercount retained memory.
Fix: Count this set when calculating mempool memory usage.
Track a mempool transaction before and after adding its txid to the unbroadcast set, which currently retains a node without changing reported memory usage.
Include `m_unbroadcast_txids` in `DynamicMemoryUsage()` to count the set nodes retained for locally submitted transactions awaiting their first successful broadcast, with at most one entry per mempool transaction.
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For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/35923.
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| ACK | jeanpablojp |
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ACK db21e03c9d50386072a1123568f917ba65dcf348
I have tested the code. m_unbroadcast_txids is a std::set<Txid> that memusage.h handles, 80 bytes per txid on my build, and it was not counted elsewhere in DynamicMemoryUsage(). Dropping the term makes the added test fail (760 <= 760), so it covers the change. Built the merge with master (05a7c47): unit suite, mempool_unbroadcast.py and mempool_persist.py pass.
