> Suppose we make font-lock-add-keywords with nil for MODE
> record its argument in some permanent buffer-local variable.
> Then changing the major mode and reenabling font-lock
> would use the same keywords previously added.
Problem is that some of those keywords should be permanent and others
shouldn't. E.g. it depends whether they correspond to a minor mode
which is permanent or not.
> That would also change the current behavior when changing a major mode
> interactively. Currently, it gets rid of these keywords. When
> changing modes interactively, the situation is thousands of times more
> likely to occur than when changing major modes inside a derived mode.
> Stefan does not seem to consider getting rid of these keywords to be
> a problem when changing modes interactively, although he does consider
> it a problem when it happens in a derived mode. Maybe there should be
The assumption is that those keywords are added via a function placed on the
major mode's hook, i.e. the keywords tweak the major mode and should thus be
removed/readded when the major mode changes.
Of course in other settings it should behave differently.
The problem is that the API is too simplistic.
Stefan
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