The most common such problem by far is when a regexp hits a pathological
exponential-matching behavior. I wish we'd fix that one instead.
It would be good to fix that, but how? It is a consequence of the
algorithm, and even recognizing these cases would seem to be a hard
problem.
Also, they're only painful because of Emacs's lack of NMI.
What is NMI?
E.g. when C-g is pressed, record the time, and if a C-g
is pressed again 2 seconds later and the first hasn't been processed yet,
then ignore the inhibit-quit flag (i.e. set it back to nil).
I don't understand the suggestion clearly. What would it do if the
second C-g is less than two seconds later? What would it do if the
second C-g is more than two seconds later?
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