Pressing ESC in telnet window freezes telnet window.

[Dunbaratu]

If you press the ESC key in the telnet window by itself, then the telnet window becomes frozen after a few seconds, refusing to work no matter what you type (the in-game terminal is still fine) and eventually it bombs out and disconnects from the server after typing enough stuff blindly.

This test was performed on an XTERM-reporting terminal in Putty.

There seems to be a bug with how the VT100 CSI sequences are being read, (e.g. things like esc [ A for up-arrow). Once an esc happens, if the following characters aren't a control sequence and instead the input snippet just ends with the esc char, the system seems incapable of dealing with that properly,