The idea is:
(A) Don't _start_ redisplay if there is pending input,
i.e. process all available input before starting redisplay.
(B) Don't _interrupt_ redisplay once it has started.
That is interesting. I never thought about the question that way.
When redisplay is as fast as it usually is nowadays, perhaps
pre-emption after redisplay starts is entirely unnecessary. We could
set up a speed value above which pre-emption never occurs, and we
could arrange to specify that speed for various kinds of terminals
that are normally very fast.
And (B) is what you get by setting `redisplay-dont-pause'.
It WAS, but not any more. We just recently changed sit-for so it will
start a redisplay even when there is input, if `redisplay-dont-pause'
is t.
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