grails-spring-security-core

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It would be handy to also support (+) on JOINED_FILTERS, e.g. for BasicAuth on a url-pattern, otherwise you need to state the whole default filter chain, or need to add the new filter using SpringSecurityUtils.clientRegisterFilter.

(+) should allow to add to the start or tail of the list, depending on its position relatively to JOINED_FILTERS.

e.g.:

[pattern:'/api/**', filters: '+myFilter, JOINED_FILTERS, -securityContextPersistenceFilter, -exceptionTranslationFilter'],

In this example, a myFilter is added to the head of the list.