From ed4446ae769f333e9e8034ca0f144d2a9fe255b6 Mon Sep 17 00:00:00 2001
From: Soner YUKSEL <grkmyksl@gmail.com>
Date: Tue, 25 Jul 2023 12:15:51 -0400
Subject: [PATCH] Fix brave/brave-ios#7737: Crash at Browsing Mode Change while
 drag-drop action in Tab Tray (brave/brave-ios#7778)

Adding check for active drag and drop while mode change
---
 .../Frontend/Browser/Tabs/TabTray/TabTrayController.swift   | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Sources/Brave/Frontend/Browser/Tabs/TabTray/TabTrayController.swift b/Sources/Brave/Frontend/Browser/Tabs/TabTray/TabTrayController.swift
index af6005e341b3..e5cd30b65d64 100644
--- a/Sources/Brave/Frontend/Browser/Tabs/TabTray/TabTrayController.swift
+++ b/Sources/Brave/Frontend/Browser/Tabs/TabTray/TabTrayController.swift
@@ -588,6 +588,12 @@ class TabTrayController: LoadingViewController {
 
   @objc func togglePrivateModeAction() {
     tabTraySearchController.isActive = false
+    
+    // Mode Change action disabled while drap-drop is active
+    // Added to prevent Diffable Data source crash
+    if tabTrayView.collectionView.hasActiveDrag || tabTrayView.collectionView.hasActiveDrop {
+      return
+    }
 
     // Record the slected index before private mode navigation
     if !privateMode {