[BRLTTY] Debugging using `brltty -b xw`

[Sebastian Humenda]

Hi

I have tried to run the BRLAPI example from `Bindings/Python/brlapi.pyx`, from
the doc string.
To test this, I stopped the global BRLTTY instance and started one with my
user using `brltty -b xw -b a2`. Then, I've started the script on the console
and hoped to see some output. I compared this with a global BRLTTY, actually
attached to a Braille display. Here, the example worked. For the X11 window
BRLTTY, the X11 window with the braille contents stayed empty. The script
output is:

```
Server version 8
Display size [40, 1]
Driver XWindow
Model all
Got output update 
got None
Cobject address  : 0x7ff2625eb7c0
object refcount : 2
object type     : 0x18e19d60
object type name: OperationError
object repr     : OperationError()
lost sys.stderr
```

Is it a missing feature in xw or a wrong usage on my side?

Thanks
Sebastian
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