Missing flow control

[jerch]

Running yes for several seconds runs into xterm.js's safety parachute:

This error indicates that over 50MB of write data is pending and still growing xterm.js' write buffer. I suggest to implement a flow control / backpressure mechanism, so noisy programs on the pty can be paused while xterm.js can catch up with the data (see https://xtermjs.org/docs/guides/flowcontrol/).

[tsl0922]

It's implemented on master now (4ab5479).