Pass the latest active key to the Block's scan function

Effectively necessary for networks on which we utilize account abstraction in
order to know what key to associate the received coins with.

processor/scanner/src/scan/mod.rs

@@ -122,6 +122,19 @@ impl<D: Db, S: ScannerFeed> ContinuallyRan for ScanTask<D, S> {
         let keys = ScannerGlobalDb::<S>::active_keys_as_of_next_to_scan_for_outputs_block(&txn)
           .expect("scanning for a blockchain without any keys set");
 
+        let latest_active_key = {
+          let mut keys = keys.clone();
+          loop {
+            // Use the most recent key
+            let key = keys.pop().unwrap();
+            // Unless this key is active, but not yet reporting
+            if key.stage == LifetimeStage::ActiveYetNotReporting {
+              continue;
+            }
+            break key.key;
+          }
+        };
+
         // The scan data for this block
         let mut scan_data = SenderScanData {
           block_number: b,
@@ -157,7 +170,7 @@ impl<D: Db, S: ScannerFeed> ContinuallyRan for ScanTask<D, S> {
 
         // Scan for each key
         for key in &keys {
-          for output in block.scan_for_outputs(key.key) {
+          for output in block.scan_for_outputs(latest_active_key, key.key) {
             assert_eq!(output.key(), key.key);
 
             /*