remove QUIT type of mediumgroupupdate

protos/SignalService.proto

@@ -57,7 +57,6 @@ message MediumGroupUpdate {
         INFO       = 1; // groupPublicKey, name, senderKeys, members, admins
         SENDER_KEY = 2; // groupPublicKey, senderKeys
         SENDER_KEY_REQUEST = 3; // groupPublicKey
-        QUIT       = 4; // groupPublicKey
     }
 
     message SenderKey {

ts/receiver/mediumGroups.ts

@@ -427,8 +427,6 @@ export async function handleMediumGroupUpdate(
     await handleNewGroup(envelope, groupUpdate);
   } else if (type === Type.INFO) {
     await handleMediumGroupChange(envelope, groupUpdate);
-  } else if (type === Type.QUIT) {
-    await handleQuit(envelope, groupUpdate);
   } else {
     window.log.error('Unknown group update type: ', type);
   }

ts/session/medium_group/index.ts

@@ -13,7 +13,6 @@ import { getChainKey } from './ratchet';
 import { MultiDeviceProtocol } from '../protocols';
 import { BufferType } from '../utils/String';
 import { UserUtil } from '../../util';
-import { MediumGroupQuitMessage } from '../messages/outgoing/content/data/mediumgroup/MediumGroupQuitMessage';
 import {
   ClosedGroupChatMessage,
   ClosedGroupMessage,

ts/session/messages/outgoing/content/data/mediumgroup/MediumGroupQuitMessage.ts

@@ -1,12 +0,0 @@
-import { SignalService } from '../../../../../../protobuf';
-import { MediumGroupMessage } from '.';
-
-export class MediumGroupQuitMessage extends MediumGroupMessage {
-  protected mediumGroupContext(): SignalService.MediumGroupUpdate {
-    const mediumGroupContext = super.mediumGroupContext();
-
-    mediumGroupContext.type = SignalService.MediumGroupUpdate.Type.QUIT;
-
-    return mediumGroupContext;
-  }
-}