message: EventIndex: Split out the statements that check for a valid event type.
diff: @@ -251,13 +251,8 @@ export default class EventIndex extends EventEmitter {
  * otherwise.
  */
  isValidEvent(ev) {
  - const validEventType = ([
  - "m.room.message",
  - "m.room.name",
  - "m.room.topic",
  - ].indexOf(ev.getType()) >= 0
  - && !ev.isRedacted() && !ev.isDecryptionFailure()
  - );
  + const isUsefulType = ["m.room.message", "m.room.name", "m.room.topic"].includes(ev.getType());
  + const validEventType = isUsefulType && !ev.isRedacted() && !ev.isDecryptionFailure();
  let validMsgType = true;
  