`get_blog_details()->post_count` should update on more actions than just `publish_post`.

Adds unit test.

Props 5um17, midxcat, strangerstudios.
Fixes #27952.

Built from https://develop.svn.wordpress.org/trunk@28835


git-svn-id: http://core.svn.wordpress.org/trunk@28639 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/ms-blogs.php

@@ -892,3 +892,38 @@ function _update_blog_date_on_post_delete( $post_id ) {
 	wpmu_update_blogs_date();
 }
 
+/**
+ * Handler for updating the blog posts count date when a post is deleted.
+ *
+ * @since 4.0
+ *
+ * @param int $post_id Post ID
+ */
+function _update_posts_count_on_delete( $post_id ) {
+	if ( 'publish' !== get_post_field( 'post_status', $post_id ) ) {
+		return;
+	}
+	
+	update_posts_count();
+}
+
+/**
+ * Handler for updating the blog posts count date when a post status changes.
+ *
+ * @since 4.0
+ *
+ * @param string $new_status The status the post is changing to.
+ * @param string $old_status The status the post is changing from.
+ */
+function _update_posts_count_on_transition_post_status( $new_status, $old_status ) {
+	if ( $new_status === $old_status ) {
+		return;
+	}
+
+	if ( 'publish' !== $new_status && 'publish' !== $old_status ) {
+		return;
+	}
+
+	update_posts_count();
+}
+

wp-includes/ms-default-filters.php

@@ -34,9 +34,10 @@ add_filter( 'allowed_redirect_hosts', 'redirect_this_site' );
 
 // Administration
 add_filter( 'term_id_filter', 'global_terms', 10, 2 );
-add_action( 'publish_post', 'update_posts_count' );
+add_action( 'delete_post', '_update_posts_count_on_delete' );
 add_action( 'delete_post', '_update_blog_date_on_post_delete' );
 add_action( 'transition_post_status', '_update_blog_date_on_post_publish', 10, 3 );
+add_action( 'transition_post_status', '_update_posts_count_on_transition_post_status', 10, 2 );
 
 // Counts
 add_action( 'admin_init', 'wp_schedule_update_network_counts');

wp-includes/ms-functions.php

@@ -1761,7 +1761,7 @@ function check_upload_mimes( $mimes ) {
  * WordPress MS stores a blog's post count as an option so as
  * to avoid extraneous COUNTs when a blog's details are fetched
  * with get_blog_details(). This function is called when posts
- * are published to make sure the count stays current.
+ * are published or unpublished to make sure the count stays current.
  *
  * @since MU
  */

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.0-alpha-20140625';
+$wp_version = '4.0-alpha-20140626';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.