Render block preview when add the block

Hi,

The extension MB Blocks only supports rendering the block after typing something to the custom field. I will inform the development team to consider supporting this case in future updates.

Quick/dirty work around for this would be to just use the mb_blocks_preview JS callback.

e.g.

    function init__container(e)
    {
        console.log('init container');
        console.log($(e.target));

        if ( $(e.target).find('> .components-placeholder').length > 0 ) {
            setTimeout(() => { 
                $('.mb-block-edit select, .mb-block-edit input').trigger('change')
            }, 1000);
        }
    }

    $(document).on('mb_blocks_preview/odin-container', init__container);