wallet: allow unspendable unmixable outputs to be discarded

src/simplewallet/simplewallet.cpp

@@ -4818,6 +4818,20 @@ bool simple_wallet::sweep_unmixable(const std::vector<std::string> &args_)
       commit_or_save(ptx_vector, m_do_not_relay);
     }
   }
+  catch (const tools::error::not_enough_unlocked_money& e)
+  {
+    fail_msg_writer() << tr("Not enough money in unlocked balance");
+    std::string accepted = input_line((boost::format(tr("Discarding %s of unmixable outputs that cannot be spent, which can be undone by \"rescan_spent\".  Is this okay?  (Y/Yes/N/No): ")) % print_money(e.available())).str());
+    if (std::cin.eof())
+      return true;
+    if (command_line::is_yes(accepted))
+    {
+      try
+      {
+        m_wallet->discard_unmixable_outputs(is_daemon_trusted());
+      } catch (...) {}
+    }
+  }
   catch (const std::exception &e)
   {
     handle_transfer_exception(std::current_exception(), is_daemon_trusted());

src/wallet/wallet2.cpp

@@ -8249,6 +8249,16 @@ std::vector<wallet2::pending_tx> wallet2::create_unmixable_sweep_transactions(bo
 
   return create_transactions_from(m_account_public_address, false, unmixable_transfer_outputs, unmixable_dust_outputs, 0 /*fake_outs_count */, 0 /* unlock_time */, 1 /*priority */, std::vector<uint8_t>(), trusted_daemon);
 }
+//----------------------------------------------------------------------------------------------------
+void wallet2::discard_unmixable_outputs(bool trusted_daemon)
+{
+  // may throw
+  std::vector<size_t> unmixable_outputs = select_available_unmixable_outputs(trusted_daemon);
+  for (size_t idx : unmixable_outputs)
+  {
+    m_transfers[idx].m_spent = true;
+  }
+}
 
 bool wallet2::get_tx_key(const crypto::hash &txid, crypto::secret_key &tx_key, std::vector<crypto::secret_key> &additional_tx_keys) const
 {

src/wallet/wallet2.h

@@ -704,6 +704,7 @@ namespace tools
     bool sign_multisig_tx(multisig_tx_set &exported_txs, std::vector<crypto::hash> &txids);
     bool sign_multisig_tx_to_file(multisig_tx_set &exported_txs, const std::string &filename, std::vector<crypto::hash> &txids);
     std::vector<pending_tx> create_unmixable_sweep_transactions(bool trusted_daemon);
+    void discard_unmixable_outputs(bool trusted_daemon);
     bool check_connection(uint32_t *version = NULL, uint32_t timeout = 200000);
     void get_transfers(wallet2::transfer_container& incoming_transfers) const;
     void get_payments(const crypto::hash& payment_id, std::list<wallet2::payment_details>& payments, uint64_t min_height = 0, const boost::optional<uint32_t>& subaddr_account = boost::none, const std::set<uint32_t>& subaddr_indices = {}) const;