With xpra 0.9.6+dfsg-1 from debian unstable on amd64 the client sometimes prints
Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/xpra/client.py", line 1121, in _screen_size_changed self.idle_add(update_size) AttributeError: 'XpraClient' object has no attribute 'idle_add'
Another backport done wrong.
fixed in r3812
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/374