From 88b1879aa28930d018b60a36ebf8ba551a2ae10d Mon Sep 17 00:00:00 2001
From: rebornix <penn.lv@gmail.com>
Date: Mon, 6 Jul 2020 11:58:44 -0700
Subject: [PATCH] fix #101681. avoid out of date splice2 triggered by hidden
 range update.

---
 .../contrib/notebook/browser/view/notebookCellList.ts         | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/vs/workbench/contrib/notebook/browser/view/notebookCellList.ts b/src/vs/workbench/contrib/notebook/browser/view/notebookCellList.ts
index 3dc707837f8..1bc13d11af5 100644
--- a/src/vs/workbench/contrib/notebook/browser/view/notebookCellList.ts
+++ b/src/vs/workbench/contrib/notebook/browser/view/notebookCellList.ts
@@ -356,6 +356,10 @@ export class NotebookCellList extends WorkbenchList<CellViewModel> implements ID
 
 	splice2(start: number, deleteCount: number, elements: CellViewModel[] = []): void {
 		// we need to convert start and delete count based on hidden ranges
+		if (start < 0 || start > this.view.length) {
+			return;
+		}
+
 		super.splice(start, deleteCount, elements);
 
 		const selectionsLeft = [];
-- 
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