Incorrect logic behavior in the screenshot method.

[andrews239]

1:        self.video.refresh(x, y, width, height)
2:        while True:
3:            update_type = await self.read()
4:            if update_type is UpdateType.VIDEO:
5:                if self.video.is_complete():
6:                    return self.video.as_rgba()

line 1: Sends refresh for ROI
line 5: Expects update for Full Frame.

Yes, some servers choose to send the entire frame update. But the RFC does not require such behavior and such server behavior is difficult to consider reasonable.