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Expose a way to filter Content Picker's list without a field
Currently if you want to use Content Picker from code (e.g. have a custom button somewhere to select some content items) what you can achieve is limited due to the fact that the item listing needs a field in the background to apply settings (like filtering
on the content type or whether the user is allowed to select multiple items).
Instead the options could be directly exposed as the controller action's parameters and thus through the script too, allowing you to use the full functionality of Content Picker without a content type containing the field and its configuration.