Because this means that every time I insert one character, redisplay
would refontify `font-lock-lines-before' in addition to the current
line.
Would that be bad?
Whether and when these lines are refontified
would be _also_ decided by the redisplay engine. And the latter doesn't
know about `font-lock-lines-before'. For example, editing the first
line in a window would not "include the line before in refontification".
This is a good point. However, it can probably be fixed by a change in
the fontification function--when it is called, it should extend the starting
point for refontification upward by the specified number of lines.
(This might be the only fix needed.)
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