From d8fe38dc01c358180f01dd2c4ff8972cc12b49a3 Mon Sep 17 00:00:00 2001
From: Ammar Ahmed <ammarahmed6506@gmail.com>
Date: Fri, 21 Aug 2026 11:37:36 +0500
Subject: [PATCH] editor: resolve virtualization scroll container lazily

---
 .../src/extensions/virtualization/viewport-plugin.ts  | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/packages/editor/src/extensions/virtualization/viewport-plugin.ts b/packages/editor/src/extensions/virtualization/viewport-plugin.ts
index 944d29023..190f4f76d 100644
--- a/packages/editor/src/extensions/virtualization/viewport-plugin.ts
+++ b/packages/editor/src/extensions/virtualization/viewport-plugin.ts
@@ -109,9 +109,7 @@ export function virtualizationPlugin(): Plugin<VirtualizationState> {
       let observer: IntersectionObserver | null = null;
       let frame = 0;
       const intersecting = new Set<string>();
-
-      const scrollParent = findScrollParent(editorView.dom);
-      if (scrollParent) scrollParent.style.overflowAnchor = "none";
+      let scrollParent: HTMLElement | null = null;
 
       const flush = () => {
         frame = 0;
@@ -153,6 +151,13 @@ export function virtualizationPlugin(): Plugin<VirtualizationState> {
 
       const observe = () => {
         observer?.disconnect();
+        // Resolve the scroll container lazily: at view-init the document may be
+        // empty (no overflow yet), so it must be re-resolved once content grows.
+        const resolved = findScrollParent(editorView.dom);
+        if (resolved && resolved !== scrollParent) {
+          resolved.style.overflowAnchor = "none";
+          scrollParent = resolved;
+        }
         observer = new IntersectionObserver(onIntersect, {
           root: scrollParent,
           // one viewport of overscan in each direction