Making Gutenberg stylesheet conditional

[RiaanKnoetze]

I'm referring to the following lines of code:

storefront/inc/class-storefront.php

Lines 286 to 287 in 7f7e6be

	wp_enqueue_style( 'storefront-gutenberg-blocks', get_template_directory_uri() . '/assets/css/base/gutenberg-blocks.css', '', $storefront_version );
	wp_style_add_data( 'storefront-gutenberg-blocks', 'rtl', 'replace' );

In instances where Gutenberg is disabled, by using a plugin/child theme with a filter, shouldn't we remove the loading of Gutenberg styles in Storefront? If blocks aren't used, there's no need to add the feature bloat on sites.

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If required, the filters that'll be set to disable Gutenberg, include:

// disable for posts
add_filter('use_block_editor_for_post', '__return_false', 10);

// disable for post types
add_filter('use_block_editor_for_post_type', '__return_false', 10);

[tiagonoronha]

@RiaanKnoetze I've made a few changes in #1122 to ensure that CSS is only loaded via Gutenberg hooks.

However, this is will still load the stylesheets in the frontend since WordPress doesn't currently include a way to know if blocks are being used in a post (that's different from checking whether the block editor is enabled).

Should WordPress add a way, it will work.