From 5bd64b167c68e853c8a9d1b2f54dc23bd23287cc Mon Sep 17 00:00:00 2001
From: Santhosh Thottingal <santhosh.thottingal@gmail.com>
Date: Fri, 14 Jan 2022 12:43:49 +0530
Subject: [PATCH] Improve the loading time of ULS language selector by fetching
 modules early

Start fetching them on mouseover without waiting for click.

Bug: T299202
Change-Id: I1ba3b8516bd01ad1bf8bb4c57d72d10ca59e06ca
---
 resources/js/ext.uls.interface.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/resources/js/ext.uls.interface.js b/resources/js/ext.uls.interface.js
index df978e89..0cfbb8e1 100644
--- a/resources/js/ext.uls.interface.js
+++ b/resources/js/ext.uls.interface.js
@@ -378,6 +378,10 @@
 		}
 
 		$trigger.on( 'click', clickHandler );
+		// Optimization: Prefetch the Resource loader modules for ULS on mouseover
+		$trigger.one( 'mouseover', function () {
+			mw.loader.load( languageSettingsModules );
+		} );
 	}
 
 	function initLanguageChangeUndoTooltip() {