bug#15045: Point jumps inappropriately around time of Semantic lexing

[Stefan Monnier]

>> I think the only reason, as with all the other places where we run
>> timers, is to make Emacs look appear more responsive, notwithstanding
>> the on-going processing.
> Is there some easy way to get a list of functions which may cause timers
> to run?  IMHO all those functions would need a word of warning in their
> doc-string.

Basically, read-event, read-char, read-key-sequence (and friends), and
accept-process-output and input-pending-p, plus any function that calls
one of them (e.g. sit-for).


        Stefan