Fix missing events in OnRecvPacket (cosmos#233)

* fix to set events to the original context

* Update modules/core/keeper/msg_server.go

Co-authored-by: Aditya <adityasripal@gmail.com>
Co-authored-by: colin axnér <25233464+colin-axner@users.noreply.github.com>

modules/core/keeper/msg_server.go

@@ -450,6 +450,10 @@ func (k Keeper) RecvPacket(goCtx context.Context, msg *channeltypes.MsgRecvPacke
 	// Cache context so that we may discard state changes from callback if the acknowledgement is unsuccessful.
 	cacheCtx, writeFn := ctx.CacheContext()
 	ack := cbs.OnRecvPacket(cacheCtx, msg.Packet, relayer)
+	// This doesn't cause duplicate events to be emitted.
+	// NOTE: The context returned by CacheContext() refers to a new EventManager, so it needs to explicitly set events to the original context.
+	// Events from callback are emitted regardless of acknowledgement success
+	ctx.EventManager().EmitEvents(cacheCtx.EventManager().Events())
 	if ack == nil || ack.Success() {
 		// write application state changes for asynchronous and successful acknowledgements
 		writeFn()