Re: Is it possible to ignore all variable except 'tab-width' in dir-locals-file or local-variables?

[Robert Pluim]

>>>>> On Wed, 23 Oct 2019 08:42:24 +0200, Michael Heerdegen 
>>>>> <michael_heerdegen@web.de> said:

    Michael> Zhang Haijun <ccsmile2008@outlook.com> writes:
    >> Is there a custom variable like ‘user-safe-local-variables’ which can
    >> be set to ‘(tab-width) to control this?

    Michael> Looks there is only an `ignored-local-variables' user option.  The
    Michael> filtering is done in `hack-local-variables-filter' if you want to 
look
    Michael> at the code.  So it seems what you want is not possible by only
    Michael> configuring an option, you would have to advice
    Michael> `hack-local-variables-filter'.

Thereʼs also 'before-hack-local-variables-hook', which you could use
to munge 'file-local-variables-alist' before it gets applied.

Robert