From d3286132461554a949d11e07bfba2aaea025608a Mon Sep 17 00:00:00 2001
From: Timo Tijhof <ttijhof@wikimedia.org>
Date: Thu, 28 Jun 2012 15:10:39 +0200
Subject: [PATCH] (bug 38024) Skip styles for modules that don't have
 stylesheets

* <s>Best viewed in IE 4 and with a 800x600 resolution.<s>
  Best viewed with -w due to additional indention.

* Saves number of <style> tags inserted, which in turn is good for
  IE's stupid stylesheet limit (bug 31676).

* Also saves a little bit of bandwidth by outputting
  {} instead of {"":""}.

Change-Id: I436a6a1c64452fc60a58fd9a478a2ac2b1328211
---
 RELEASE-NOTES-1.20                         |  2 ++
 includes/resourceloader/ResourceLoader.php | 32 ++++++++++++----------
 2 files changed, 20 insertions(+), 14 deletions(-)

diff --git a/RELEASE-NOTES-1.20 b/RELEASE-NOTES-1.20
index a838a37889..709f2ea0e9 100644
--- a/RELEASE-NOTES-1.20
+++ b/RELEASE-NOTES-1.20
@@ -128,6 +128,8 @@ upgrade PHP if you have not done so prior to upgrading MediaWiki.
 * (bug 27283) SqlBagOStuff breaks PostgreSQL transactions.
 * (bug 35727) mw.Api ajax() should put token parameter last.
 * (bug 37708) mw.Uri.clone() should make a deep copy.
+* (bug 38024) ResourceLoader should not create empty stylesheets for modules
+  that don't have stylesheets.
 
 === API changes in 1.20 ===
 * (bug 34316) Add ability to retrieve maximum upload size from MediaWiki API.
diff --git a/includes/resourceloader/ResourceLoader.php b/includes/resourceloader/ResourceLoader.php
index b3d7e75786..93dac7b60b 100644
--- a/includes/resourceloader/ResourceLoader.php
+++ b/includes/resourceloader/ResourceLoader.php
@@ -713,23 +713,27 @@ class ResourceLoader {
 				// Styles
 				$styles = array();
 				if ( $context->shouldIncludeStyles() ) {
-					// If we are in debug mode without &only= set, we'll want to return an array of URLs
-					// See comment near shouldIncludeScripts() for more details
-					if ( $context->getDebug() && !$context->getOnly() && $module->supportsURLLoading() ) {
-						$styles = $module->getStyleURLsForDebug( $context );
-					} else {
-						$styles = $module->getStyles( $context );
-						// Minify CSS before embedding in mw.loader.implement call
-						// (unless in debug mode)
-						if ( !$context->getDebug() ) {
-							foreach ( $styles as $media => $style ) {
-								if ( is_string( $style ) ) {
-									$styles[$media] = $this->filter( 'minify-css', $style );
+					// Don't create empty stylesheets like array( '' => '' ) for modules
+					// that don't *have* any stylesheets (bug 38024).
+					$stylePairs = $module->getStyles( $context );
+					if ( count ( $stylePairs ) ) {
+						// If we are in debug mode without &only= set, we'll want to return an array of URLs
+						// See comment near shouldIncludeScripts() for more details
+						if ( $context->getDebug() && !$context->getOnly() && $module->supportsURLLoading() ) {
+							$styles = $module->getStyleURLsForDebug( $context );
+						} else {
+							// Minify CSS before embedding in mw.loader.implement call
+							// (unless in debug mode)
+							if ( !$context->getDebug() ) {
+								foreach ( $stylePairs as $media => $style ) {
+									if ( is_string( $style ) ) {
+										$stylePairs[$media] = $this->filter( 'minify-css', $style );
+									}
 								}
 							}
+							// Combine styles into @media groups as one big string
+							$styles = array( '' => self::makeCombinedStyles( $stylePairs ) );
 						}
-						// Combine styles for all media types
-						$styles = array( '' => self::makeCombinedStyles( $styles ) );
 					}
 				}
 
-- 
2.20.1