Fix workflow replay to ignore -fm suffix (#1014)

When existing workflow is being replayed with old activity names
it can result in non-deterministic error if activity was scheduled
with older cadence client version.

Ignore the suffix the same way, as the rest part of name is ignored
by extracting only the `lastPartOfName`

internal/internal_task_handlers.go

@@ -1227,6 +1227,7 @@ matchLoop:
 }
 
 func lastPartOfName(name string) string {
+	name = strings.TrimSuffix(name, "-fm")
 	lastDotIdx := strings.LastIndex(name, ".")
 	if lastDotIdx < 0 || lastDotIdx == len(name)-1 {
 		return name

internal/internal_worker_test.go

@@ -258,6 +258,32 @@ func (s *internalWorkerTestSuite) TestReplayWorkflowHistory() {
 	require.NoError(s.T(), err)
 }
 
+func (s *internalWorkerTestSuite) TestReplayWorkflowHistory_Incomplete() {
+	taskList := "taskList1"
+	testEvents := []*shared.HistoryEvent{
+		createTestEventWorkflowExecutionStarted(1, &shared.WorkflowExecutionStartedEventAttributes{
+			WorkflowType: &shared.WorkflowType{Name: common.StringPtr("go.uber.org/cadence/internal.testReplayWorkflow")},
+			TaskList:     &shared.TaskList{Name: common.StringPtr(taskList)},
+			Input:        testEncodeFunctionArgs(getDefaultDataConverter()),
+		}),
+		createTestEventDecisionTaskScheduled(2, &shared.DecisionTaskScheduledEventAttributes{}),
+		createTestEventDecisionTaskStarted(3),
+		createTestEventDecisionTaskCompleted(4, &shared.DecisionTaskCompletedEventAttributes{}),
+		createTestEventActivityTaskScheduled(5, &shared.ActivityTaskScheduledEventAttributes{
+			ActivityId:   common.StringPtr("0"),
+			ActivityType: &shared.ActivityType{Name: common.StringPtr("testActivity-fm")},
+			TaskList:     &shared.TaskList{Name: &taskList},
+		}),
+	}
+
+	history := &shared.History{Events: testEvents}
+	logger := getLogger()
+	replayer := NewWorkflowReplayer()
+	replayer.RegisterWorkflow(testReplayWorkflow)
+	err := replayer.ReplayWorkflowHistory(logger, history)
+	require.NoError(s.T(), err)
+}
+
 func (s *internalWorkerTestSuite) TestReplayWorkflowHistory_LocalActivity() {
 	taskList := "taskList1"
 	testEvents := []*shared.HistoryEvent{