The problem is that if you call these functions with `nil' for MODE,
this sets up Font Lock for the current major mode, which could be an
ancestor mode (it calls font-lock-set-defaults).
I don't understand. How can the current major mode "be" an ancestor
mode? Do you mean that the font-lock settings came from an ancestor
mode?
With "current" major mode, I mean the value of `major-mode' when
font-lock-add-keywords is called. That could be the parent mode or
even an earlier ancestor mode of the final major mode.
Ok, now I understand what you meant by that particular point.
Could you give a self-contained and clear explanation of
why this is a problem?
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