From 7370a556ff77b1761184823d21971d6f5e025c72 Mon Sep 17 00:00:00 2001
From: Zihua Li <i@zihua.li>
Date: Thu, 6 Jul 2023 17:16:46 +0800
Subject: [PATCH] Make sure blot is attached before calling formatAt

---
 blots/scroll.ts | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/blots/scroll.ts b/blots/scroll.ts
index 89efb3a783..1c1120d402 100644
--- a/blots/scroll.ts
+++ b/blots/scroll.ts
@@ -192,8 +192,10 @@ class Scroll extends ScrollBlot {
 
       renderBlocks.forEach(renderBlock => {
         if (renderBlock.type === 'block') {
-          const block = this.createBlock(renderBlock.attributes);
-          this.insertBefore(block, refBlot || undefined);
+          const block = this.createBlock(
+            renderBlock.attributes,
+            refBlot || undefined,
+          );
           insertInlineContents(block, 0, renderBlock.delta);
         } else {
           const blockEmbed = this.create(
@@ -382,7 +384,7 @@ class Scroll extends ScrollBlot {
     return renderBlocks;
   }
 
-  private createBlock(attributes: AttributeMap) {
+  private createBlock(attributes: AttributeMap, refBlot?: Blot) {
     let blotName: string | undefined;
     const formats: AttributeMap = {};
 
@@ -400,6 +402,8 @@ class Scroll extends ScrollBlot {
       blotName ? attributes[blotName] : undefined,
     ) as ParentBlot;
 
+    this.insertBefore(block, refBlot || undefined);
+
     const length = block.length();
     Object.entries(formats).forEach(([key, value]) => {
       block.formatAt(0, length, key, value);