Echoing of keys and process I/O

[Daniel Jensen]

When Emacs is communicating with a process, the display of multi-
character keys in the echo area is disturbed. I was wondering why this
is so, and if there is anything that can be done about it.

For example, in shell mode:

    while true; do echo; sleep .5; done

Now I can't see keystrokes in the echo area unless I set
echo-keystrokes to <= 0.5.

Another peculiarity, which is new in Emacs 22 and also apparently
caused by process communication, is that a space is inserted before
the key in the echo area. I can see the text jump to the right.