From 5ae67fda7ff1463c5f23374df5e2a40b652c4f03 Mon Sep 17 00:00:00 2001
From: Elian Doran <contact@eliandoran.me>
Date: Tue, 2 Dec 2025 12:13:40 +0200
Subject: [PATCH] fix(ckeditor/math): math can be inserted in code blocks
 (closes #7913)

---
 packages/ckeditor5-math/src/mathediting.ts | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/packages/ckeditor5-math/src/mathediting.ts b/packages/ckeditor5-math/src/mathediting.ts
index a5f1a11db..53b50614b 100644
--- a/packages/ckeditor5-math/src/mathediting.ts
+++ b/packages/ckeditor5-math/src/mathediting.ts
@@ -62,6 +62,16 @@ export default class MathEditing extends Plugin {
 			allowAttributes: [ 'equation', 'type', 'display', 'fontSize', 'fontColor', 'fontBackgroundColor' ]
 		} );
 
+		// Prevent <mathtex-inline> from being inserted inside <codeBlock>
+		schema.addChildCheck( ( context, childDefinition ) => {
+			if ( childDefinition && childDefinition.name === 'mathtex-inline' ) {
+				// If the context is inside a codeBlock, disallow it
+				if ( context.endsWith( 'codeBlock' ) ) {
+					return false;
+				}
+			}
+		});
+
 		schema.register( 'mathtex-display', {
 			inheritAllFrom: '$blockObject',
 			allowAttributes: [ 'equation', 'type', 'display', 'fontSize', 'fontColor' ]