In addition to that, there would be a problem with major modes that do
follow the conventions but call font-lock-{add,remove}-keywords with
nil for MODE in their body instead of their hook. Major modes are not
supposed to do that. A nil argument was not designed to be used that
way and you said:
I just looked for all the calls to font-lock-add-keywords in Emacs.
In no case does any major mode call font-lock-add-keywords directly,
or even fairly directly.
No major mode calls font-lock-add-keywords directly, or even fairly
directly. However, I have not done the studying necessary to
determine whether any of those calls could ever possibly be reached
from a major mode function. And certainly, if a minor mode uses
font-lock-add-keywords, and then people use define-global-minor-mode
to make a global version of it, then font-lock-add-keywords will be
called from major modes through after-change-major-mode-hook.
Are you saying that kind of use will cause no problem?
If so, could you be more precise about which kinds of uses of
font-lock-add-keywords from a major mode could cause a problem?
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