From 0d09618865a938721ee35b5c91f41acd8f95cbb1 Mon Sep 17 00:00:00 2001
From: Martynas Bagdonas <git.martynas@gmail.com>
Date: Thu, 15 Sep 2022 11:53:11 +0300
Subject: [PATCH] Fix `focusContextPane` error when pressing tab in standalone
 PDF window Fixes #2823

---
 chrome/content/zotero/xpcom/reader.js | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/chrome/content/zotero/xpcom/reader.js b/chrome/content/zotero/xpcom/reader.js
index 59c2c9e1cc..78281d60a6 100644
--- a/chrome/content/zotero/xpcom/reader.js
+++ b/chrome/content/zotero/xpcom/reader.js
@@ -1065,18 +1065,17 @@ class ReaderInstance {
 					return;
 				}
 				case 'focusSplitButton': {
-					let win = Zotero.getMainWindow();
-					if (win) {
-						win.document.getElementById('zotero-tb-toggle-item-pane').focus();
+					if (this instanceof ReaderTab) {
+						let win = Zotero.getMainWindow();
+						if (win) {
+							win.document.getElementById('zotero-tb-toggle-item-pane').focus();
+						}
 					}
 					return;
 				}
 				case 'focusContextPane': {
-					let win = Zotero.getMainWindow();
-					if (win) {
-						if (!this._window.ZoteroContextPane.focus()) {
-							this.focusFirst();
-						}
+					if (this instanceof ReaderWindow || !this._window.ZoteroContextPane.focus()) {
+						this.focusFirst();
 					}
 					return;
 				}