Blocks: Parse blocks when displaying posts.

Posts containing blocks are now correctly handled when displaying on the front end, including dynamic blocks and nested blocks.

Props pento.

Merges [43752] to trunk.

See #45109.

git-svn-id: https://develop.svn.wordpress.org/trunk@44118 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/blocks/shortcode.php

@@ -0,0 +1,32 @@
+<?php
+/**
+ * Server-side rendering of the `core/shortcode` block.
+ *
+ * @package gutenberg
+ */
+
+/**
+ * Performs wpautop() on the shortcode block content.
+ *
+ * @param array  $attributes The block attributes.
+ * @param string $content    The block content.
+ *
+ * @return string Returns the block content.
+ */
+function render_block_core_shortcode( $attributes, $content ) {
+	return wpautop( $content );
+}
+
+/**
+ * Registers the `core/shortcode` block on server.
+ */
+function register_block_core_shortcode() {
+	register_block_type(
+		'core/shortcode',
+		array(
+			'render_callback' => 'render_block_core_shortcode',
+		)
+	);
+}
+
+add_action( 'init', 'register_block_core_shortcode' );