filterLiveUids method
void
filterLiveUids()
在有 已选中的用户离开的时候要重新过滤下
Implementation
void filterLiveUids() {
liveUids.removeWhere((userId) {
final user = _arguments.roomContext.getMember(userId.toString());
return user == null || (!user.isVideoOn && !user.isSharingScreen);
});
}