From d83ec19c231b5ccb620869b324752f05193550ed Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adomas=20Ven=C4=8Dkauskas?= <adomas.ven@gmail.com>
Date: Wed, 14 Apr 2021 12:25:55 +0300
Subject: [PATCH] Do not try to open/close empty collection tree rows on + and
 - hotkeys

Causes performance issues
---
 chrome/content/zotero/collectionTree.jsx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/chrome/content/zotero/collectionTree.jsx b/chrome/content/zotero/collectionTree.jsx
index ea31481b4b..4cd5979f51 100644
--- a/chrome/content/zotero/collectionTree.jsx
+++ b/chrome/content/zotero/collectionTree.jsx
@@ -999,6 +999,7 @@ var CollectionTree = class CollectionTree extends LibraryTree {
 	}
 	
 	toggleOpenState = async (index) => {
+		if (this.isContainerEmpty(index)) return;
 		if (this.isContainerOpen(index)) {
 			return this._closeContainer(index);
 		}
@@ -2030,7 +2031,7 @@ var CollectionTree = class CollectionTree extends LibraryTree {
 	}
 
 	_closeContainer(row, skipMap) {
-		if (!this.isContainerOpen(row)) return;
+		if (!this.isContainerOpen(row) || this.isContainerEmpty(row)) return;
 		
 		this.selection.selectEventsSuppressed = true;
 		let selectParent = this.getParentIndex(this.selection.focused);