I ran 'ls /usr/share/doc' in a psusan session the other day and the
output hung part way through the long directory listing. This turned
out to be because the ssh-connection channel window had run out
temporarily, and PuTTY had sent a WINDOW_ADJUST extending it again,
which the connection layer acted on by calling chan_set_input_wanted
... which sesschan was ignoring with a comment saying /* I don't think
we need to do anything here */.
Well, turns out we do need to. Implemented the simplest possible
unblocking action.
55d19f6295