Blocks: Define the `edit_posts` capability on the `wp_block` post type.

Meta capability mapping doesn't recurse through multiple meta definitions, which creates a situation where the capabilities test is looking for the non-existent primitive capability `edit_blocks`, which should instead be mapped to `edit_posts`.

Defining the `edit_posts` capability when the `wp_block` post type is registered causes this check to change to to the `edit_posts` capability.

Props aduth.
Fixes #45373.


Built from https://develop.svn.wordpress.org/trunk@44687


git-svn-id: http://core.svn.wordpress.org/trunk@44518 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/post.php

@@ -292,6 +292,7 @@ function create_initial_post_types() {
 				'read'                   => 'edit_posts',
 				// You need to be able to publish posts, in order to create blocks.
 				'create_posts'           => 'publish_posts',
+				'edit_posts'             => 'edit_posts',
 				'edit_published_posts'   => 'edit_published_posts',
 				'delete_published_posts' => 'delete_published_posts',
 				'edit_others_posts'      => 'edit_others_posts',

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-beta1-44686';
+$wp_version = '5.1-beta1-44687';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.