Fix staking reward issue

bin/node/runtime/src/lib.rs

@@ -78,8 +78,8 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	// and set impl_version to equal spec_version. If only runtime
 	// implementation changes and behavior does not, then leave spec_version as
 	// is and increment impl_version.
-	spec_version: 198,
-	impl_version: 198,
+	spec_version: 199,
+	impl_version: 199,
 	apis: RUNTIME_API_VERSIONS,
 };
 

frame/session/src/historical.rs

@@ -100,8 +100,9 @@ impl<T: Trait> Module<T> {
 /// Specialization of the crate-level `OnSessionEnding` which returns the old
 /// set of full identification when changing the validator set.
 pub trait OnSessionEnding<ValidatorId, FullIdentification>: crate::OnSessionEnding<ValidatorId> {
-	/// If there was a validator set change, its returns the set of new validators along with the
-	/// old validators and their full identifications.
+	/// If there was a validator set change in the session will_apply_at, its returns the set of
+	/// new validators along with the old validators and their full identifications.
+	/// Old validators are the validators for the session just before will_apply_at.
 	fn on_session_ending(ending: SessionIndex, will_apply_at: SessionIndex)
 		-> Option<(Vec<ValidatorId>, Vec<(ValidatorId, FullIdentification)>)>;
 }

frame/staking/Cargo.toml

@@ -25,6 +25,7 @@ pallet-balances = { path = "../balances" }
 pallet-timestamp = { path = "../timestamp" }
 pallet-staking-reward-curve = { path = "../staking/reward-curve"}
 substrate-test-utils = { path = "../../test-utils" }
+pretty_assertions = "0.6.1"
 
 [features]
 equalize = []