From 412c5ee91d6956dfec32b35a3cba399f3171f914 Mon Sep 17 00:00:00 2001
From: Shadowfacts <me@shadowfacts.net>
Date: Sun, 7 Jul 2024 10:01:33 -0700
Subject: [PATCH] Fix multi column navigation not animating when scrolling back
 while replacing multiple columns

---
 .../Utilities/MultiColumnNavigationController.swift   | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/Tusker/Screens/Utilities/MultiColumnNavigationController.swift b/Tusker/Screens/Utilities/MultiColumnNavigationController.swift
index b11bdd17..e43bd7f7 100644
--- a/Tusker/Screens/Utilities/MultiColumnNavigationController.swift
+++ b/Tusker/Screens/Utilities/MultiColumnNavigationController.swift
@@ -17,7 +17,6 @@ protocol MultiColumnNavigationCustomTargetProviding {
 
 class MultiColumnNavigationController: UIViewController {
     
-    private var isManuallyUpdating = false
     private var _viewControllers: [UIViewController] = []
     var viewControllers: [UIViewController] {
         get {
@@ -25,8 +24,7 @@ class MultiColumnNavigationController: UIViewController {
         }
         set {
             _viewControllers = newValue
-            if isViewLoaded,
-               !isManuallyUpdating {
+            if isViewLoaded {
                 updateViews()
                 scrollToEnd(animated: false)
             }
@@ -143,7 +141,14 @@ class MultiColumnNavigationController: UIViewController {
     }
     
     private func scrollColumnToEnd(columnIndex: Int, animated: Bool) {
+        // Laying out may change the content offset if we have fewer columns than before,
+        // but we want to keep the original offset so that we can animate smoothly to the final one.
+        let origContentOffset = scrollView.contentOffset
         scrollView.layoutIfNeeded()
+        if animated {
+            scrollView.contentOffset = origContentOffset
+        }
+        
         let column = stackView.arrangedSubviews[columnIndex]
         let columnFrame = column.convert(column.bounds, to: scrollView)
         let offset: CGFloat