Allow which metatags are visible on the field widget to be editable

I rerolled the patch to 2.0.0.
For now I'm not able to set the branch to 2.0.x and provide a merge request, hope someone else can do it.

This would be a welcome addition to the Metatags module! The forms are too long now and contain obsolete information:

• The Basic tags contain two fields that are no longer supported. This information clutters the interface.
• The Open Graph tags form is really long.

I mostly try to avoid printing the form for website editors (mostly by using a summary field) but sometimes they want a custom metatag description.

I'm currently hiding the unused metatags in Seven with some CSS (I use a small custom module to override the admin styling):

#edit-field-metatags-0-basic .form-item,
#edit-field-metatags-0-open-graph .form-item {
	display: none;
}

#edit-field-metatags-0-basic .form-item.form-item-field-metatags-0-basic-title,
#edit-field-metatags-0-basic .form-item.form-item-field-metatags-0-basic-description,
#edit-field-metatags-0-open-graph .form-item.form-item-field-metatags-0-open-graph-og-title,
#edit-field-metatags-0-open-graph .form-item.form-item-field-metatags-0-open-graph-og-description {
	display: block;
}

This will expose only the meta title and description on the basic and Open Graph fields. It's a dirty solutions but it helps to clean up the interface.

Changing the status as I have successfully applied this patch.

Anyone have any success re-rolling against 2.1?

Re-rolled patch against 2.1.x branch and created MR.

Thanks for the patch. It's working fine with metatag 2.1.0. Just adding my 2 cents that using the small select box is not the best UX.

I tested the merge request and it seemed to work perfectly (Metatag 2.1.0, D10.3.9). Thank you for the great feature!

I agree with balagan that selection of multiple fields with the current widget was not super easy/intuitive. But the ability to select the editable metatags in the first place is a huge improvement. I don't have any better suggestions at the moment.