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In the initial version of SSH proxying that only opened direct-tcpip channels, this wasn't important. But as of commit 6f7c52dccee36f6, we now support invoking a command or subsystem on the proxy SSH server, and those _can_ generate stderr data which we must now separate from stdout. Happily, we have a perfectly sensible thing to _do_ with it: the same thing we'd do with stderr coming from a local proxy subprocess, to wit, pass it to log_proxy_stderr so that it can appear in the terminal window (if configured to) and the Event Log.