Reword this paragraph making it clear that as long as a and a-b are not
bound, the a-b-c binding works even if b is bound.
The 4-key limit for sequences was raised to 16 by a5dbf34094, because
MP_MAX_KEY_DOWN is used for both the number of keys that can be held
down and for the key history size. Just remove the related sentence
since you're never going to need sequences longer than 16 keys.
Guido Cella
f471f8cfa5