From 875b6593ecf38d2679bbdebcf65a30c97f99c7b8 Mon Sep 17 00:00:00 2001
From: Infocatcher <infocatcher.dev.null@gmail.com>
Date: Tue, 12 Aug 2014 19:17:02 +0400
Subject: [PATCH] Add notes about shallowCopy() usage (#146)

---
 bootstrap.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/bootstrap.js b/bootstrap.js
index 1f823d8..e098bc3 100644
--- a/bootstrap.js
+++ b/bootstrap.js
@@ -1595,7 +1595,7 @@ var privateTab = {
 		var logPrefix = "dontSaveClosedPrivateTabs(" + dontSave + "): ";
 		if(dontSave) {
 			var _this = this;
-			var shallowCopy = "assign" in Object
+			var shallowCopy = "assign" in Object // Firefox 34+
 				? function(o) {
 					return Object.assign({}, o);
 				}
@@ -1619,6 +1619,7 @@ var privateTab = {
 						return !isPrivate;
 					});
 					if(windowChanged) {
+						// Note: we can't modify original windowState object (will change real undo close history)
 						var clonedWindowState = shallowCopy(windowState);
 						clonedWindowState._closedTabs = closedTabs;
 						windows[i] = clonedWindowState;