Merge #20428: tests: shrink feature_taproot transfer of funds tx

7ffac12545 tests: shrink feature_taproot transfer of funds tx (Anthony Towns)

Pull request description:

  When moving funds from node 1 to node 0 for the pre-activation tests, there can be a large number of inputs, potentially resulting in a tx that is larger than standardness rules allow, or that takes a long time to sign. This just takes the top 500 outputs, which is plenty (~90% of the wallet balance).

ACKs for top commit:
  luke-jr:
    utACK 7ffac12545
  MarcoFalke:
    cr ACK 7ffac12545

Tree-SHA512: 68445b4827dddb9a8e8614d61a68f5bbd7152557bf940be0a75741cb49deeff1566198da1a777ac66cb3fed93e64a30bf895875d6cc6ae9e48275e3febb620a6

test/functional/feature_taproot.py

@@ -1442,17 +1442,23 @@ class TaprootTest(BitcoinTestFramework):
         self.nodes[1].generate(101)
         self.test_spenders(self.nodes[1], spenders_taproot_active(), input_counts=[1, 2, 2, 2, 2, 3])
 
-        # Transfer funds to pre-taproot node.
+        # Transfer value of the largest 500 coins to pre-taproot node.
         addr = self.nodes[0].getnewaddress()
+
+        unsp = self.nodes[1].listunspent()
+        unsp = sorted(unsp, key=lambda i: i['amount'], reverse=True)
+        unsp = unsp[:500]
+
         rawtx = self.nodes[1].createrawtransaction(
             inputs=[{
                 'txid': i['txid'],
                 'vout': i['vout']
-            } for i in self.nodes[1].listunspent()],
-            outputs={addr: self.nodes[1].getbalance()},
+            } for i in unsp],
+            outputs={addr: sum(i['amount'] for i in unsp)}
         )
         rawtx = self.nodes[1].signrawtransactionwithwallet(rawtx)['hex']
-        # Transaction is too large to fit into the mempool, so put it into a block
+
+        # Mine a block with the transaction
         block = create_block(tmpl=self.nodes[1].getblocktemplate(NORMAL_GBT_REQUEST_PARAMS), txlist=[rawtx])
         add_witness_commitment(block)
         block.rehash()