Allows other work to be unblocked while xtermjs/xterm.js#4069 is worked
through.
To enable testing the popup window handling, the standalone app allows
opening of SSH sessions in new windows by holding down the alt key
while pressing the SSH button.
Signed-off-by: Mihai Parparita <mihai@tailscale.com>
Remove test prefix added to validate the error code from 27f36f77c364562bc1ca660c241291e23606e54d.
Signed-off-by: Mihai Parparita <mihai@tailscale.com>
We were just outputting them to the terminal, but that's hard to debug
because we immediately tear down the terminal when getting an error.
Signed-off-by: Mihai Parparita <mihai@tailscale.com>