Don't open block appender modal if only one block is allowed

Hey,

I am only allowing one block on my page using this code:

add_filter('allowed_block_types', 'sp_allowed_block_types', 10, 2);

function sp_allowed_block_types($allowed_blocks, $post)
{

    if ($post->post_type === 'page' || $post->post_type === 'post') {
        $allowed_blocks = array(
            'sp/block',
        );
    }

    return $allowed_blocks;
}

It doesn't really make sense to allow the modal in this case, the appender icon should instead insert the only block that is available.

[mtias]

This is how the "navigation" and "buttons" blocks work already. cc @jorgefilipecosta

[chrisvanpatten]

Looks like #16708 is where this was added. @dnnsjsk are you using Gutenberg in WordPress core or via the plugin? It doesn't look like this change made it to WP core yet.

[mtias]

Ah, indeed.

@chrisvanpatten I am using the Gutenberg plugin. The problem also persists when only allowing the Paragraph block.

[jorgefilipecosta]

I did some tests, and it seems like the behavior currently implemented to insert the block if only one block is allowed only happens for insertions inside inner blocks. Outside innerblocks for the root bock, it does not occur. This seems inconsistent, and if possible, it is something that we should fix.

[paaljoachim]

Hello everyone. It would be great with a status update here.
@jorgefilipecosta is this issue something you might be able to take a closer look at?

[jorgefilipecosta]

Hi @paaljoachim, yes I can take a close look into this issue :)

[Mamaduka]

I'm going to close this. The Inserter's behavior has changed recently. Now, it displays the allowed block at the top, followed by the remaining blocks. See #62169.