From 3365a1bcc8842e4b97bf52a63e89348593e69469 Mon Sep 17 00:00:00 2001
From: "Davide P. Cervone" <dpvc@union.edu>
Date: Thu, 24 Oct 2024 09:12:17 -0400
Subject: [PATCH] Improve merging of math lists (mathjax/MathJax#3301).

---
 ts/handlers/html/HTMLDocument.ts | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/ts/handlers/html/HTMLDocument.ts b/ts/handlers/html/HTMLDocument.ts
index 385ffd584..cabdd1f74 100644
--- a/ts/handlers/html/HTMLDocument.ts
+++ b/ts/handlers/html/HTMLDocument.ts
@@ -124,14 +124,16 @@ export class HTMLDocument<N, T, D> extends AbstractMathDocument<N, T, D> {
     nodes: HTMLNodeArray<N, T>
   ): Location<N, T> {
     const adaptor = this.adaptor;
-    for (const list of nodes[N]) {
-      const [node, n] = list;
+    const inc = 1 / (nodes[N].length || 1);
+    let i = N;
+    for (const [node, n] of nodes[N]) {
       if (index <= n && adaptor.kind(node) === '#text') {
-        return { node: node, n: Math.max(index, 0), delim: delim };
+        return { i, node, n: Math.max(index, 0), delim };
       }
       index -= n;
+      i += inc;
     }
-    return { node: null, n: 0, delim: delim };
+    return { node: null, n: 0, delim };
   }
 
   /**