Force a theme directory scan after installing and upgrading themes. P…

…rops nacin. fixes #20919

git-svn-id: http://core.svn.wordpress.org/trunk@21064 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-upgrader.php

@@ -764,6 +764,7 @@ function install($package) {
 
 		// Force refresh of theme update information
 		delete_site_transient('update_themes');
+		search_theme_directories( true );
 		foreach ( wp_get_themes() as $theme )
 			$theme->cache_delete();
 
@@ -812,6 +813,7 @@ function upgrade($theme) {
 
 		// Force refresh of theme update information
 		delete_site_transient('update_themes');
+		search_theme_directories( true );
 		foreach ( wp_get_themes() as $theme )
 			$theme->cache_delete();
 
@@ -901,6 +903,7 @@ function bulk_upgrade($themes) {
 
 		// Force refresh of theme update information
 		delete_site_transient('update_themes');
+		search_theme_directories( true );
 		foreach ( wp_get_themes() as $theme )
 			$theme->cache_delete();