bug#11822: 24.1; emacsclient terminal mode captures escape characters as text

[Stefan Monnier]

> speed contributes to the user experience too. I know I'm sort of jumping
> around between use cases here, but different use cases are impacted
> differently by different aspects of the network handling here.

Right.  I think we should take one case at a time.
E.g. let's first try and make sure that opening a new frame on a new
display doesn't force a heavy redisplay of all other frames (it'll
necessarily force a minor redisplay in the previously selected frame,
but that should be OK).


        Stefan