Change task naming for faster listing in future

server/ajax/task/task.go

@@ -119,14 +119,16 @@ func (t *Task) AppendTags(tags []string) {
 	t.Tags = append(t.Tags, tags...)
 }
 
-func (t *Task) SetComplete(state bool) {
+func (t *Task) SetComplete(state bool) bool {
 	t.touch()
+	changed := t.Complete != state
 	t.Complete = state
 	if t.Complete {
 		t.Completed = time.Now()
 	} else {
 		t.Completed = time.Time{}
 	}
+	return changed
 }
 
 func (t *Task) SetPrio(prio int) {