Clear cache on changing the threads FF (#4581)

* clear cache on changing the threads FF

# Conflicts:
#	PreviewTests/Sources/__Snapshots__/PreviewTests/labsScreen.iPad-pseudo-0.png
#	PreviewTests/Sources/__Snapshots__/PreviewTests/labsScreen.iPhone-16-pseudo-0.png

* fix tests

ElementX/Sources/Screens/LabsScreen/LabsScreenCoordinator.swift

@@ -14,14 +14,35 @@ struct LabsScreenCoordinatorParameters {
     let appSettings: AppSettings
 }
 
+enum LabsScreenCoordinatorAction {
+    case clearCache
+}
+
 final class LabsScreenCoordinator: CoordinatorProtocol {
     private let viewModel: LabsScreenViewModelProtocol
     
+    private let actionsSubject: PassthroughSubject<LabsScreenCoordinatorAction, Never> = .init()
+    var actions: AnyPublisher<LabsScreenCoordinatorAction, Never> {
+        actionsSubject.eraseToAnyPublisher()
+    }
+    
+    private var cancellables = Set<AnyCancellable>()
+    
     init(parameters: LabsScreenCoordinatorParameters) {
         viewModel = LabsScreenViewModel(labsOptions: parameters.appSettings)
     }
     
-    func start() { }
+    func start() {
+        viewModel
+            .actionsPublisher
+            .sink { [weak self] action in
+                switch action {
+                case .clearCache:
+                    self?.actionsSubject.send(.clearCache)
+                }
+            }
+            .store(in: &cancellables)
+    }
         
     func toPresentable() -> AnyView {
         AnyView(LabsScreen(context: viewModel.context))

ElementX/Sources/Screens/LabsScreen/LabsScreenModels.swift

@@ -7,9 +7,13 @@
 
 import Foundation
 
-enum LabsScreenViewAction { }
+enum LabsScreenViewAction {
+    case clearCache
+}
 
-enum LabsScreenViewModelAction { }
+enum LabsScreenViewModelAction {
+    case clearCache
+}
 
 struct LabsScreenViewState: BindableState {
     var bindings: LabsScreenViewStateBindings

ElementX/Sources/Screens/LabsScreen/LabsScreenViewModel.swift

@@ -22,4 +22,11 @@ class LabsScreenViewModel: LabsScreenViewModelType, LabsScreenViewModelProtocol
         
         super.init(initialViewState: state)
     }
+    
+    override func process(viewAction: LabsScreenViewAction) {
+        switch viewAction {
+        case .clearCache:
+            actionsSubject.send(.clearCache)
+        }
+    }
 }

ElementX/Sources/Screens/LabsScreen/View/LabsScreen.swift

@@ -14,7 +14,7 @@ struct LabsScreen: View {
     var body: some View {
         Form {
             header
-            settingsSection
+            threadsSection
         }
         .compoundList()
         .navigationTitle(L10n.screenLabsTitle)
@@ -39,16 +39,23 @@ struct LabsScreen: View {
                         .multilineTextAlignment(.center)
                         .foregroundColor(.compound.textSecondary)
                 }
+                .compoundListSectionHeader()
             }
             .frame(maxWidth: .infinity)
         }
     }
     
-    private var settingsSection: some View {
+    private var threadsSection: some View {
         Section {
             ListRow(label: .default(title: L10n.screenLabsEnableThreads,
                                     icon: \.threads),
                     kind: .toggle($context.threadsEnabled))
+        } footer: {
+            Text(L10n.screenLabsEnableThreadsDescription)
+                .compoundListSectionFooter()
+        }
+        .onChange(of: context.threadsEnabled) { _, _ in
+            context.send(viewAction: .clearCache)
         }
     }
 }
@@ -56,7 +63,7 @@ struct LabsScreen: View {
 // MARK: - Previews
 
 struct LabsScreen_Previews: PreviewProvider, TestablePreview {
-    static let viewModel = LabsScreenViewModel(labsOptions: ServiceLocator.shared.settings)
+    static let viewModel = LabsScreenViewModel(labsOptions: AppSettings())
     
     static var previews: some View {
         NavigationStack {