CompactLinks: support sortPrepend from WikiBaseClient

Bug: T138973
Change-Id: I64b7aa37d8a6b3cac92d492a33fe6f8cb04ce0e6

UniversalLanguageSelector.hooks.php

@@ -311,7 +311,8 @@ class UniversalLanguageSelectorHooks {
 			$wgULSEventLogging,
 			$wgULSImeSelectors, $wgULSNoImeSelectors,
 			$wgULSFontRepositoryBasePath,
-			$wgExtensionAssetsPath;
+			$wgExtensionAssetsPath,
+			$wgWBClientSettings;
 
 		// Place constant stuff here (not depending on request context)
 		if ( is_string( $wgULSGeoService ) ) {
@@ -334,6 +335,12 @@ class UniversalLanguageSelectorHooks {
 				'/UniversalLanguageSelector/data/fontrepo/fonts/';
 		}
 
+		// Cannot check where whether CLL is enabled for a particular user. The overhead
+		// of including this data is small.
+		if ( isset( $wgWBClientSettings['sortPrepend'] ) ) {
+			$vars['wgULSCompactLinksPrepend'] = $wgWBClientSettings['sortPrepend'];
+		}
+
 		return true;
 	}