Add extrafields support

Create MR and moved to needs review.

I stumbled into this as well.

It looks like, for example, the links field that seems to be an addition of core itself is not a regular field but an extra field / computed field.

Having this field active makes sdc_display unusable as it will fail after mapping a view mode to a component.

+1 to having this, or at least having the ability to "bypass" extra fields to avoid the fatal error.

Automatically closed - issue fixed for 2 weeks with no activity.