Index: wordpressdotorg/wp-includes/ms-functions.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- wordpressdotorg/wp-includes/ms-functions.php	(revision 25649)
+++ wordpressdotorg/wp-includes/ms-functions.php	(revision )
@@ -258,6 +258,13 @@
 
 	if ( $reassign != '' ) {
 		$reassign = (int) $reassign;
+
+		// get posts by user to invalidate cache
+		$posts = get_posts( array( 'author' => $user_id, 'numberposts' => -1 ) );
+		foreach( $posts as $post ) {
+			clean_post_cache( $post );
+		}
+
 		$wpdb->query( $wpdb->prepare("UPDATE $wpdb->posts SET post_author = %d WHERE post_author = %d", $reassign, $user_id) );
 		$wpdb->query( $wpdb->prepare("UPDATE $wpdb->links SET link_owner = %d WHERE link_owner = %d", $reassign, $user_id) );
 	}