What?

There is currently a bug that users without permissions to edit a specific product type aren't allowed to see the Query Loop block in the editor if it queries that product type. For example, if an author user edits a post containing the Query Loop block with Pages as the post type, the block only renders an infinite spinner.

Why?

While right now users are not allowed to select post types they don't have permissions to edit in the Query Loop block, other users might modify their posts and add the block. Right now, Gutenberg only renders an infinite scroll which seems broken.

In addition to that, some plugins out there like WooCommerce might use blocks like Post Title for products and make them available to users without permission to edit titles.

How?

This PR:

• Fixes the Query Loop block so it fetches the post items with context: view, so users don't need to have permission to edit that post type to be able to see the Query Loop block preview.
• Fixes the Post Title block in a similar way, so it fetches data with context: view, so the correct title is displayed.

Testing Instructions

Only Gutenberg:

1. With an author user, create a post.
2. Now, with an admin, edit that post and insert the Query Loop block. Select a Custom query with Pages as the post type.
3. Edit the post again with the author.
4. Verify the Query Loop block renders correctly, instead of being stuck showing a spinner.

Before	After

On WooCommerce:

1. With an author user, insert the Product block.
2. Verify the product title is displayed.

Before	After