message: Clear all messages for muted user.
diff: @@ -442,10 +442,7 @@ export class ChatClient {
  if (room && room.isGroupRoom) {
  // Remove their messages from view.
  if (this.messages[roomId].length) {
  - const index = this.messages[roomId].findIndex(message => message.userId === userId);
  - if (index !== -1) {
  - this.messages[roomId].splice(index, 1);
  - }
  + this.messages[roomId] = this.messages[roomId].filter(message => message.userId !== userId);
  }
  // Mark that they're muted in the user list of the room.
  