From 06910b1e5865617f1c1552896e92eab32221c430 Mon Sep 17 00:00:00 2001
From: Brent Simmons <brent@ranchero.com>
Date: Sun, 22 Jan 2023 14:57:56 -0800
Subject: [PATCH] =?UTF-8?q?Avoid=20force-unwrapping,=20which=20was=20causi?=
 =?UTF-8?q?ng=20a=20crash.=20Add=20an=20`assertionFailure`=20so=20we=20can?=
 =?UTF-8?q?=20catch=20this=20issue=20in=20the=20act=20=E2=80=94=C2=A0we=20?=
 =?UTF-8?q?need=20to=20know=20why=20an=20item=20would=20not=20be=20a=20Nod?=
 =?UTF-8?q?e.=20Fix=20https://github.com/Ranchero-Software/NetNewsWire/iss?=
 =?UTF-8?q?ues/3824?=
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---
 Mac/MainWindow/Sidebar/SidebarViewController.swift | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Mac/MainWindow/Sidebar/SidebarViewController.swift b/Mac/MainWindow/Sidebar/SidebarViewController.swift
index 99b33cb90..26077cae8 100644
--- a/Mac/MainWindow/Sidebar/SidebarViewController.swift
+++ b/Mac/MainWindow/Sidebar/SidebarViewController.swift
@@ -371,7 +371,10 @@ protocol SidebarDelegate: AnyObject {
 	}
 
 	func outlineView(_ outlineView: NSOutlineView, isGroupItem item: Any) -> Bool {
-		let node = item as! Node
+		guard let node = item as? Node else {
+			assertionFailure("Expected item to be a Node.")
+			return false
+		}
 		return node.isGroupItem
 	}