From 608e6806396e1b84413e75ddb6ec3b0f10385018 Mon Sep 17 00:00:00 2001
From: "Davide P. Cervone" <dpvc@union.edu>
Date: Mon, 11 Sep 2023 11:02:46 -0400
Subject: [PATCH] Propery handle placement of scripts on \vcenter, \vbox, and
 \vtop. (mathjax/MathJax#3091)

---
 ts/output/common/Wrappers/scriptbase.ts | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/ts/output/common/Wrappers/scriptbase.ts b/ts/output/common/Wrappers/scriptbase.ts
index 37e1f9755..93bebb8d4 100644
--- a/ts/output/common/Wrappers/scriptbase.ts
+++ b/ts/output/common/Wrappers/scriptbase.ts
@@ -462,12 +462,13 @@ export function CommonScriptbaseMixin<
      */
     public getBaseCore(): WW {
       let core = this.getSemanticBase() || this.childNodes[0];
+      let node = core?.node;
       while (core &&
              ((core.childNodes.length === 1 &&
-               (core.node.isKind('mrow') || core.node.isKind('TeXAtom') ||
-                core.node.isKind('mstyle') || core.node.isKind('mpadded') ||
-                core.node.isKind('mphantom') || core.node.isKind('semantics'))) ||
-              (core.node.isKind('munderover') &&
+               (node.isKind('mrow') || node.isKind('TeXAtom') ||
+                node.isKind('mstyle') || (node.isKind('mpadded') && !node.getProperty('vbox')) ||
+                node.isKind('mphantom') || node.isKind('semantics'))) ||
+              (node.isKind('munderover') &&
                (core as any as CommonMunderover<N, T, D, JX, WW, WF, WC, CC, VV, DD, FD, FC>).isMathAccent))) {
         this.setBaseAccentsFor(core);
         core = core.childNodes[0];