Multisig::as_multi_threshold_1: Send MultisigExecuted event

prdoc/pr_8925.prdoc

@@ -0,0 +1,10 @@
+title: 'Multisig::as_multi_threshold_1: Send `MultisigExecuted` event'
+doc:
+- audience: Runtime User
+  description: |-
+    So the behavior is the same as `as_multi` when it comes to sending an event.
+
+    Closes: https://github.com/paritytech/polkadot-sdk/issues/8924
+crates:
+- name: pallet-multisig
+  bump: patch

substrate/frame/multisig/src/lib.rs

@@ -318,12 +318,20 @@ pub mod pallet {
 			ensure!(!other_signatories.is_empty(), Error::<T>::TooFewSignatories);
 			let other_signatories_len = other_signatories.len();
 			ensure!(other_signatories_len < max_sigs, Error::<T>::TooManySignatories);
-			let signatories = Self::ensure_sorted_and_insert(other_signatories, who)?;
+			let signatories = Self::ensure_sorted_and_insert(other_signatories, who.clone())?;
 
 			let id = Self::multi_account_id(&signatories, 1);
 
-			let call_len = call.using_encoded(|c| c.len());
-			let result = call.dispatch(RawOrigin::Signed(id).into());
+			let (call_len, call_hash) = call.using_encoded(|c| (c.len(), blake2_256(&c)));
+			let result = call.dispatch(RawOrigin::Signed(id.clone()).into());
+
+			Self::deposit_event(Event::MultisigExecuted {
+				approving: who,
+				timepoint: Self::timepoint(),
+				multisig: id,
+				call_hash,
+				result: result.map(|_| ()).map_err(|e| e.error),
+			});
 
 			result
 				.map(|post_dispatch_info| {
@@ -582,7 +590,7 @@ pub mod pallet {
 						let remaining_unreserved = T::Currency::unreserve(&who, excess);
 						if !remaining_unreserved.is_zero() {
 							defensive!(
-								"Failed to unreserve for full amount for multisig. (Call Hash, Requested, Actual): ", 
+								"Failed to unreserve for full amount for multisig. (Call Hash, Requested, Actual): ",
 								(call_hash, excess, excess.saturating_sub(remaining_unreserved))
 							);
 						}

substrate/frame/multisig/src/tests.rs

@@ -595,6 +595,16 @@ fn multisig_1_of_3_works() {
 			call_transfer(6, 15)
 		));
 
+		System::assert_last_event(
+			pallet_multisig::Event::MultisigExecuted {
+				approving: 1,
+				timepoint: now(),
+				multisig: multi,
+				call_hash: hash,
+				result: Ok(()),
+			}
+			.into(),
+		);
 		assert_eq!(Balances::free_balance(6), 15);
 	});
 }