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由 Piotr Sarnacki 提交于
This change is needed, because we must take namespace into account and if controller's/mailer's class is namespaced, engine's paths should be set instead of application's ones. The nice side effect of this is removing unneeded logic in ActionController::Base.inherited - now the helpers_path should be set correctly even for engine's controllers, so helper(:all) will always include correct helpers.
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