2141 - attempt to deal with slow networks

On slow networks sometimes escape sequences were being partially
consumed, causing junk to be added to the editor when you pressed arrow
keys and so on. Now we have a way to wait.

Empirically seems to work if I page-up and then scroll back up using
up-arrow. Before I'd consistently get junk even on my local machine. Now
I no longer do.

If we still see problems I'll increase the wait time and see if the
increase helps. Then we'll know more about this approach.

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