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Re: font-lock as a single command

From: Emanuel Berg
Subject: Re: font-lock as a single command
Date: Sat, 13 Feb 2021 02:50:56 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) 
Christopher Dimech wrote:

>>   If optional argument HOW is ‘set’, they are used to
>>   replace the current highlighting list. If HOW is any
>>   other non-nil value, they are added at the end of the
>>   current highlighting list.
>
> I understood none of that. What is "replace the current
> highlighting list" about?

nil -> add at beginning (default)
set -> replace
t   -> append

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