Restrict base tag config to processHtml method #2458
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This PR is fix to #2452 . I'm new to this library and can't estimate possible side effects, so this is more a draft. Also there are no new tests, since I don't know how (I know PHP Unit, but not how things processed and stored by this library and the cache is cleared before the render method is finished).
This PR changes how the base tag content is processed. Instead of overriding the global protocol, baseHost and basePath properties, it introduces local variables. This will fix that local images are not loaded correct, if remote is disabled and a base tag is set (without a base tag css files are not loaded).