Client drops when switching teletypewriter terminals

[no-lex]

When switching away from the standard display window to another teletypewriter, the game times out and disconnects. This may be caused by the networking update code being tied to the refresh rate, which is not happening because the X environment is not being shown.

This is an incredibly niche issue and should affect almost nobody, since using the teletypewriters is fairly uncommon and usually completely avoidable.
Of course, since only Linux installations even have teletypewriter terminals, this issue only affects Linux users.