Allow Mapped Fields to be Required (e.g. for title field)

Note: I set this category to "Bug Report" because I assume that it should be impossible to configure Gutenberg to lead to a 500 error.

Actually kind of waiting for this 🌱 Make pre-save entity validation more commonplace (e.g., the default) Active
But I guess we can do some validation when "pushing" the block value into the node entity (on the existing entity_presave hook).
I don't think it would be necessary to have a "required" property to the template since we can get that from the field that is mapped.
It would be nice to have some kind of visual indication that the block is required and I think we can do that by getting the info from the field.

This also does not add any sort of required indicator. I needed something quick that prevented people from trying to save nodes with no titles.

Not easy to fit a visual indicator for the required mapping fields. And I mean that in a styling perspective. I tried the usual (*), a red outline border and even a different background color for the block but I didn't like the results.

I made some changes so the mapping fields filter is ready to handle the required fields but, for now, I just added at the sidebar a text telling that the field is required 🤷‍♂️

We'll revisit this with some designers/UX experts opinions 😉

For now, I'm happy with the MR. Good work and thank you @loze.

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