From 8ca7356489c0cdc522558075c8fd6873c43818e8 Mon Sep 17 00:00:00 2001
From: Martynas Bagdonas <git.martynas@gmail.com>
Date: Thu, 18 Aug 2022 10:09:09 +0300
Subject: [PATCH] Fix regression for broken "Snow in Page" Fixes #2764
 Regression from 7ec54fd

---
 chrome/content/zotero/xpcom/reader.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/chrome/content/zotero/xpcom/reader.js b/chrome/content/zotero/xpcom/reader.js
index d3aae23131..546ad7e4d7 100644
--- a/chrome/content/zotero/xpcom/reader.js
+++ b/chrome/content/zotero/xpcom/reader.js
@@ -1376,7 +1376,9 @@ class Reader {
 		this.triggerAnnotationsImportCheck(itemID);
 		let reader;
 
-		if (!allowDuplicate) {
+		// If duplicating is not allowed, and no reader instance is loaded for itemID,
+		// try to find an unloaded tab and select it. Zotero.Reader.open will then be called again
+		if (!allowDuplicate && !this._readers.find(r => r._itemID === itemID)) {
 			let win = Zotero.getMainWindow();
 			if (win) {
 				let existingTabID = win.Zotero_Tabs.getTabIDByItemID(itemID);