From 6a60a2163a9484daa7bbeb01e03738ac0ff1453b Mon Sep 17 00:00:00 2001
From: Marijn Haverbeke <marijn@haverbeke.berlin>
Date: Wed, 20 Sep 2023 13:51:50 +0200
Subject: [PATCH] Fix a bug in DOM updates

FIX: Fix a bug that could cause the document DOM to be incorrectly updated on
some types of viewport changes.

Closes https://github.com/codemirror/dev/issues/1258
---
 src/contentview.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/contentview.ts b/src/contentview.ts
index 11c48f5..5b6640d 100644
--- a/src/contentview.ts
+++ b/src/contentview.ts
@@ -292,7 +292,7 @@ export function replaceRange(parent: ContentView, fromI: number, fromOff: number
   if (toI < children.length) {
     let after = children[toI]
     // Make sure the end of the child after the update is preserved in `after`
-    if (after && toOff < after.length) {
+    if (after && (toOff < after.length || after.breakAfter && last?.breakAfter)) {
       // If we're splitting a child, separate part of it to avoid that
       // being mangled when updating the child before the update.
       if (fromI == toI) {