Merge PR #5622: Track proposal handler events on success

CHANGELOG.md

@@ -56,6 +56,7 @@ and provided directly the IAVL store.
 
 ### Bug Fixes
 
+* (x/gov) [\#5622](https://github.com/cosmos/cosmos-sdk/pull/5622) Track any events emitted from a proposal's handler upon successful execution.
 * (types) [\#5579](https://github.com/cosmos/cosmos-sdk/pull/5579) The IAVL `Store#Commit` method has been refactored to
 delete a flushed version if it is not a snapshot version. The root multi-store now keeps track of `commitInfo` instead
 of `types.CommitID`. During `Commit` of the root multi-store, `lastCommitInfo` is updated from the saved state

x/gov/abci.go

@@ -60,6 +60,12 @@ func EndBlocker(ctx sdk.Context, keeper Keeper) {
 				tagValue = types.AttributeValueProposalPassed
 				logMsg = "passed"
 
+				// The cached context is created with a new EventManager. However, since
+				// the proposal handler execution was successful, we want to track/keep
+				// any events emitted, so we re-emit to "merge" the events into the
+				// original Context's EventManager.
+				ctx.EventManager().EmitEvents(cacheCtx.EventManager().Events())
+
 				// write state to the underlying multi-store
 				writeCache()
 			} else {