From 8292fe90e371310da5cc8f6b05aa2e313ba4f90d Mon Sep 17 00:00:00 2001
From: Abijeet <abijeetpatro@gmail.com>
Date: Tue, 16 May 2023 17:47:19 +0530
Subject: [PATCH] uls.lcd: Add auto-correcting code when index goes beyond max
 index

Leave the error logging code in place in order to identify any
other places where this issue occurs.

Bug: https://phabricator.wikimedia.org/T328956
---
 src/jquery.uls.lcd.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/jquery.uls.lcd.js b/src/jquery.uls.lcd.js
index 39bf8f7..c5f5da4 100644
--- a/src/jquery.uls.lcd.js
+++ b/src/jquery.uls.lcd.js
@@ -112,8 +112,15 @@
 			if ( this.navigationIndex === null ) {
 				this.navigationIndex = 0;
 			} else {
-				this.navigationIndex++;
+				// Auto-correct the index. It has been noticed that the navigationIndex goes beyond the
+				// max index sometimes. See: phab:T328956#8854835
+				if ( this.navigationIndex > maxIndex ) {
+					this.navigationIndex = maxIndex;
+				} else {
+					this.navigationIndex++;
+				}
 			}
+
 			this.highlightLanguageOption();
 		},