From 695d7f2fa93aaea4b98a2139157922956699fd8b Mon Sep 17 00:00:00 2001
From: Bryan Housel <bhousel@gmail.com>
Date: Mon, 5 Aug 2024 13:54:03 -0400
Subject: [PATCH] Revert 18e9e4984, only ask to close window if user has
 changed something (closes #1507)

---
 modules/core/EditSystem.js | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/modules/core/EditSystem.js b/modules/core/EditSystem.js
index 7e556a09b5..609b5d3cc9 100644
--- a/modules/core/EditSystem.js
+++ b/modules/core/EditSystem.js
@@ -135,9 +135,11 @@ export class EditSystem extends AbstractSystem {
 
         // Setup event handlers
         window.addEventListener('beforeunload', e => {
-          e.preventDefault();
-          this.saveBackup();
-          return (e.returnValue = '');  // show browser prompt
+          if (this._history.length > 1) {  // user did something
+            e.preventDefault();
+            this.saveBackup();
+            return (e.returnValue = '');  // show browser prompt
+          }
         });
 
         window.addEventListener('unload', () => this._mutex.unlock());