More Moderation tweaks (#2566)

* Show room member role changes in the timeline.

* Fix a bug in room flow coordinator.

* Tidy up roles and permissions flow.

* Refresh the power levels in the room details screen.

* Automatically update permissions after saving.

* Remove extra button.

* Add a short delay to the roles and permissions screen snapshots.
The permissions rows are now in a loading state initially.

ElementX/Sources/Screens/RoomChangePermissionsScreen/RoomChangePermissionsScreenCoordinator.swift

@@ -27,7 +27,7 @@ struct RoomChangePermissionsScreenCoordinatorParameters {
 }
 
 enum RoomChangePermissionsScreenCoordinatorAction {
-    case cancel
+    case complete
 }
 
 final class RoomChangePermissionsScreenCoordinator: CoordinatorProtocol {
@@ -55,8 +55,8 @@ final class RoomChangePermissionsScreenCoordinator: CoordinatorProtocol {
             
             guard let self else { return }
             switch action {
-            case .cancel:
-                actionsSubject.send(.cancel)
+            case .complete:
+                actionsSubject.send(.complete)
             }
         }
         .store(in: &cancellables)

ElementX/Sources/Screens/RoomChangePermissionsScreen/RoomChangePermissionsScreenModels.swift

@@ -18,7 +18,7 @@ import Foundation
 import MatrixRustSDK
 
 enum RoomChangePermissionsScreenViewModelAction {
-    case cancel
+    case complete
 }
 
 struct RoomChangePermissionsScreenViewState: BindableState {

ElementX/Sources/Screens/RoomChangePermissionsScreen/RoomChangePermissionsScreenViewModel.swift

@@ -21,8 +21,8 @@ import SwiftUI
 typealias RoomChangePermissionsScreenViewModelType = StateStoreViewModel<RoomChangePermissionsScreenViewState, RoomChangePermissionsScreenViewAction>
 
 class RoomChangePermissionsScreenViewModel: RoomChangePermissionsScreenViewModelType, RoomChangePermissionsScreenViewModelProtocol {
-    let roomProxy: RoomProxyProtocol
-    let userIndicatorController: UserIndicatorControllerProtocol
+    private let roomProxy: RoomProxyProtocol
+    private let userIndicatorController: UserIndicatorControllerProtocol
     private var actionsSubject: PassthroughSubject<RoomChangePermissionsScreenViewModelAction, Never> = .init()
     
     var actionsPublisher: AnyPublisher<RoomChangePermissionsScreenViewModelAction, Never> {
@@ -71,14 +71,7 @@ class RoomChangePermissionsScreenViewModel: RoomChangePermissionsScreenViewModel
         switch await roomProxy.applyPowerLevelChanges(changes) {
         case .success:
             MXLog.info("Success")
-        case .failure:
-            context.alertInfo = AlertInfo(id: .generic)
-            return
-        }
-        
-        switch await roomProxy.powerLevels() {
-        case .success(let powerLevels):
-            state.currentPermissions = .init(powerLevels: powerLevels)
+            actionsSubject.send(.complete)
         case .failure:
             context.alertInfo = AlertInfo(id: .generic)
             return