From f942736a1e83f3e05827e53023b972fc5fb2e13e Mon Sep 17 00:00:00 2001
From: Monica Kozbial <kozbial@google.com>
Date: Tue, 23 Feb 2021 14:35:21 -0800
Subject: [PATCH] Erratic scroll fix (#4650)

* Resize fix

* Update fix
---
 core/workspace_svg.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/core/workspace_svg.js b/core/workspace_svg.js
index fda7eeba7..7cf51e85f 100644
--- a/core/workspace_svg.js
+++ b/core/workspace_svg.js
@@ -1726,7 +1726,11 @@ Blockly.WorkspaceSvg.prototype.getBlocksBoundingBox = function() {
 
   // Start at 1 since the 0th block was used for initialization.
   for (var i = 1; i < topElements.length; i++) {
-    var blockBoundary = topElements[i].getBoundingRectangle();
+    var topElement = topElements[i];
+    if (topElement.isInsertionMarker && topElement.isInsertionMarker()) {
+      continue;
+    }
+    var blockBoundary = topElement.getBoundingRectangle();
     if (blockBoundary.top < boundary.top) {
       boundary.top = blockBoundary.top;
     }