Sliding sync tweaks (#470)

* Show the splash screen again after failing to restore a session

* Fix visible rooms cold cache not working. Construct the visibleRoomsView before calling the sliding sync builder, process invalid entries directly if the allRoomsView is not available

* Stop building custom identifiers for invalidated rooms, we still have duplicates coming from filled ones.

* Fix visibleItemRangePublisher debouncer, guard against changing the range while the view isn't "live" yet

* Add more logs

ElementX/Sources/Application/AppCoordinator.swift

@@ -143,6 +143,7 @@ class AppCoordinator: AppCoordinatorProtocol {
                 self.restoreUserSession()
             case (.restoringSession, .failedRestoringSession, .signedOut):
                 self.showLoginErrorToast()
+                self.presentSplashScreen(isSoftLogout: false)
             case (.restoringSession, .succeededRestoringSession, .signedIn):
                 self.hideLoadingIndicator()
                 self.setupUserSession()
@@ -390,6 +391,8 @@ class AppCoordinator: AppCoordinatorProtocol {
 
     @objc
     private func applicationWillResignActive() {
+        MXLog.info("Application will resign active")
+        
         guard backgroundTask == nil else {
             return
         }
@@ -404,6 +407,8 @@ class AppCoordinator: AppCoordinatorProtocol {
 
     @objc
     private func applicationDidBecomeActive() {
+        MXLog.info("Application did become active")
+        
         backgroundTask?.stop()
         backgroundTask = nil
 
@@ -416,6 +421,8 @@ class AppCoordinator: AppCoordinatorProtocol {
     private func observeNetworkState() {
         let reachabilityNotificationIdentifier = "io.element.elementx.reachability.notification"
         ServiceLocator.shared.networkMonitor.reachabilityPublisher.sink { reachable in
+            MXLog.info("Reachability changed to \(reachable)")
+            
             if reachable {
                 ServiceLocator.shared.userNotificationController.retractNotificationWithId(reachabilityNotificationIdentifier)
             } else {