message: blank out UserInfo avatar when changing between members
diff: @@ -1388,6 +1388,7 @@ const UserInfoHeader = ({onClose, member, e2eStatus}) => {
  <div>
  <div>
  <MemberAvatar
  + key={member.userId} // to instantly blank the avatar when UserInfo changes members
  member={member}
  width={2 * 0.3 * window.innerHeight} // 2x@30vh
  height={2 * 0.3 * window.innerHeight} // 2x@30vh
  