[Twisted-Python] TerminalSession instance has no attribute 'windowChanged'

[Maxim Lacrima]

Hello!

When size of terminal window of ssh client is changed, then twisted ssh
server throws an exception:

exceptions.AttributeError: TerminalSession instance has no attribute
'windowChanged'

`manhole_ssh.TerminalSession` doesn't implement this method, but according
to ISession interface it should.

Is this a bug?

I use insults to create some curses-like ui and I need widgets to be
redrawn when the size of window is changed.

-- 
Regards,
Maxim
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