Because this means that every time I insert one character, redisplay
would refontify `font-lock-lines-before' in addition to the current
line.
That might be somewhat slower--but how much? Would it even be
noticeable?
jit-lock's after-change hook would only reset the
fontified property to nil. Whether and when these lines are refontified
would be _also_ decided by the redisplay engine.
It's not decided by the redisplay engine alone. When calls for
a certain region to be fontified, jit-lock could be changed to look
at the previous line too.
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