From 1b61be71b902fa8a6d60a8500cc4136b919d878b Mon Sep 17 00:00:00 2001
From: Abe Jellinek <jellinek@berkeley.edu>
Date: Fri, 9 May 2025 10:36:26 -0400
Subject: [PATCH] isPaneCollapsed(): Use correct check

We don't know if collapsibleParent is non-null, but we already know that
its previous sibling is the splitter if it is.
---
 chrome/content/zotero/elements/utils/collapsiblePane.mjs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/chrome/content/zotero/elements/utils/collapsiblePane.mjs b/chrome/content/zotero/elements/utils/collapsiblePane.mjs
index d407dbe03a..6970d9598d 100644
--- a/chrome/content/zotero/elements/utils/collapsiblePane.mjs
+++ b/chrome/content/zotero/elements/utils/collapsiblePane.mjs
@@ -31,7 +31,7 @@
  */
 export function isPaneCollapsed(pane) {
 	let collapsibleParent = pane.closest('splitter:not([hidden="true"]) + *');
-	if (collapsibleParent.previousElementSibling?.localName !== 'splitter') {
+	if (!collapsibleParent) {
 		return false;
 	}
 	return collapsibleParent.getAttribute('collapsed') === 'true';