Fix launch white screen when chat list ready never fires

switchToFilter / updateAvailableFilters could drop completion when All Chats
was hidden or the target folder was missing, so ApplicationContext never
attached the root controller (white host view). Always complete the switch,
pick a real fallback folder, set mainReady even if the switch stalls, and
time out isReady after 2.5s.

Co-authored-by: D3C0Y <decoder-dev@users.noreply.github.com>

Author: cursoragent

CHANGELOG.md

@@ -4,6 +4,13 @@
 Тег релиза = `v{app}-{tagSuffix}` (например `v12.9.2-3845`); CI кладёт секцию тега в GitHub Release notes.
 Теги `*-pre` публикуются как GitHub **pre-release** (не Latest).
 
+## [v12.9.2-3854-pre] — 2026-08-18
+
+Pre-release: фикс белого экрана при запуске. Sideload smoke, не Latest.
+
+### Fixed
+- Запуск больше не зависает на белом экране, если чат-лист не успевает стать ready (скрытие «Все чаты» / смена папки / `switchToFilter` без completion). Через 2.5 с UI всё равно показывается.
+
 ## [v12.9.2-3853-pre] — 2026-08-18
 
 Pre-release: Extra по разделам + фичи из Swiftgram. Sideload smoke, не Latest.

submodules/ChatListUI/Sources/ChatListController.swift

@@ -4088,14 +4088,7 @@ public class ChatListControllerImpl: TelegramBaseController, ChatListController
                 resolvedItems = []
             }
 
-            let firstItem = countAndFilterItems.1.first?.0 ?? .allChats
-            let firstItemEntryId: ChatListFilterTabEntryId
-            switch firstItem {
-                case .allChats:
-                    firstItemEntryId = .all
-                case let .filter(id, _, _, _):
-                    firstItemEntryId = .filter(id)
-            }
+            let firstItemEntryId = resolvedItems.first?.id ?? .all
 
             var selectedEntryId = !strongSelf.initializedFilters ? firstItemEntryId : strongSelf.chatListDisplayNode.mainContainerNode.currentItemFilter
             if !strongSelf.initializedFilters, ForkExtrasHotFlags.rememberLastFolder {
@@ -4163,16 +4156,24 @@ public class ChatListControllerImpl: TelegramBaseController, ChatListController
             if isPremium == nil && items.isEmpty {
                 strongSelf.mainReady.set(strongSelf.chatListDisplayNode.mainContainerNode.currentItemNode.ready)
             } else if !strongSelf.initializedFilters {
-                if selectedEntryId != strongSelf.chatListDisplayNode.mainContainerNode.currentItemFilter {
-                    strongSelf.chatListDisplayNode.mainContainerNode.switchToFilter(id: selectedEntryId, animated: false, completion: { [weak self] in
-                        if let strongSelf = self {
-                            strongSelf.mainReady.set(strongSelf.chatListDisplayNode.mainContainerNode.currentItemNode.ready)
-                        }
+                strongSelf.initializedFilters = true
+                let setMainReady: () -> Void = { [weak strongSelf] in
+                    guard let strongSelf else {
+                        return
+                    }
+                    strongSelf.mainReady.set(strongSelf.chatListDisplayNode.mainContainerNode.currentItemNode.ready)
+                }
+                let currentFilter = strongSelf.chatListDisplayNode.mainContainerNode.currentItemFilter
+                if selectedEntryId != currentFilter, availableFilters.contains(where: { $0.id == selectedEntryId }) {
+                    strongSelf.chatListDisplayNode.mainContainerNode.switchToFilter(id: selectedEntryId, animated: false, completion: {
+                        setMainReady()
+                    })
+                    Queue.mainQueue().after(1.0, {
+                        setMainReady()
                     })
                 } else {
-                    strongSelf.mainReady.set(strongSelf.chatListDisplayNode.mainContainerNode.currentItemNode.ready)
+                    setMainReady()
                 }
-                strongSelf.initializedFilters = true
             }
 
             let animated = strongSelf.didSetupTabs

submodules/ChatListUI/Sources/ChatListControllerNode.swift

@@ -850,9 +850,14 @@ public final class ChatListContainerNode: ASDisplayNode, ASGestureRecognizerDele
                 }
             }
             if !availableFilters.contains(where: { $0.id == self.selectedId }) {
-                self.switchToFilter(id: .all, completion: {
+                let fallbackId = availableFilters.first?.id ?? .all
+                if fallbackId != self.selectedId, availableFilters.contains(where: { $0.id == fallbackId }) {
+                    self.switchToFilter(id: fallbackId, animated: false, completion: {
+                        apply()
+                    })
+                } else {
                     apply()
-                })
+                }
             } else {
                 apply()
             }
@@ -874,6 +879,9 @@ public final class ChatListContainerNode: ASDisplayNode, ASGestureRecognizerDele
         if id != self.selectedId, let index = self.availableFilters.firstIndex(where: { $0.id == id }) {
             if let itemNode = self.itemNodes[id] {
                 guard let (layout, navigationBarHeight, visualNavigationHeight, originalNavigationHeight, cleanNavigationBarHeight, insets, isReorderingFilters, isEditing, inlineNavigationLocation, inlineNavigationTransitionFraction, storiesInset) = self.validLayout else {
+                    self.selectedId = id
+                    self.applyItemNodeAsCurrent(id: id, itemNode: itemNode)
+                    completion?()
                     return
                 }
 
@@ -1006,7 +1014,11 @@ public final class ChatListContainerNode: ASDisplayNode, ASGestureRecognizerDele
                     }
                     return
                 }
+            } else {
+                completion?()
             }
+        } else {
+            completion?()
         }
     }
 

submodules/TelegramUI/Sources/ApplicationContext.swift

@@ -257,7 +257,8 @@ final class AuthorizedApplicationContext {
             |> map { $0 && $1 }
             |> filter { $0 }
             |> take(1)
-            self.isReady.set(combinedReady)
+            self.isReady.set(combinedReady
+            |> timeout(2.5, queue: Queue.mainQueue(), alternate: .single(true)))
         } else {
             self.isReady.set(.single(true))
         }

submodules/TelegramUI/Sources/TelegramRootController.swift

@@ -252,10 +252,17 @@ public final class TelegramRootController: NavigationController, TelegramRootCon
         self.rootTabController = tabBarController
         self.pushViewController(tabBarController, animated: false)
         self.hideTabBarDisposable?.dispose()
+        var appliedHideTabBar = false
         self.hideTabBarDisposable = (forkExtrasSettings(accountManager: self.context.sharedContext.accountManager)
         |> map { $0.hideTabBar }
         |> distinctUntilChanged
         |> deliverOnMainQueue).startStrict(next: { [weak self] hidden in
+            if !appliedHideTabBar {
+                appliedHideTabBar = true
+                if !hidden {
+                    return
+                }
+            }
             (self?.rootTabController as? TabBarControllerImpl)?.updateIsTabBarHidden(hidden, transition: .animated(duration: 0.25, curve: .easeInOut))
         })
     }