From 2697ae50402a713965cf075054cc309378959a0c Mon Sep 17 00:00:00 2001
From: Benjamin Pasero <benjpas@microsoft.com>
Date: Tue, 10 Mar 2020 08:39:32 +0100
Subject: [PATCH] web - guard against creating workbench more than once

---
 src/vs/workbench/workbench.web.api.ts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/vs/workbench/workbench.web.api.ts b/src/vs/workbench/workbench.web.api.ts
index 9f18e7bf59d..8aa59dc7659 100644
--- a/src/vs/workbench/workbench.web.api.ts
+++ b/src/vs/workbench/workbench.web.api.ts
@@ -230,8 +230,17 @@ interface IWorkbenchConstructionOptions {
  * @param domElement the container to create the workbench in
  * @param options for setting up the workbench
  */
+let created = false;
 async function create(domElement: HTMLElement, options: IWorkbenchConstructionOptions): Promise<void> {
 
+	// Assert that the workbench is not created more than once. We currently
+	// do not support this and require a full context switch to clean-up.
+	if (created) {
+		throw new Error('Unable to create the VSCode workbench more than once.');
+	} else {
+		created = true;
+	}
+
 	// Startup workbench
 	await main(domElement, options);
 
-- 
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