set ui window color to fix glitch

deltachat-ios.xcodeproj/project.pbxproj

@@ -146,7 +146,6 @@
 		AEACE2DF1FB3246400DCDD78 /* Message.swift in Sources */ = {isa = PBXBuildFile; fileRef = AEACE2DE1FB3246400DCDD78 /* Message.swift */; };
 		AEACE2E31FB32B5C00DCDD78 /* Constants.swift in Sources */ = {isa = PBXBuildFile; fileRef = AEACE2E21FB32B5C00DCDD78 /* Constants.swift */; };
 		AEACE2E51FB32E1900DCDD78 /* Utils.swift in Sources */ = {isa = PBXBuildFile; fileRef = AEACE2E41FB32E1900DCDD78 /* Utils.swift */; };
-		AEC679EA241A906C007DDBE1 /* UINavigationController+Extension.swift in Sources */ = {isa = PBXBuildFile; fileRef = AEC679E9241A906C007DDBE1 /* UINavigationController+Extension.swift */; };
 		AEE56D762253431E007DC082 /* AccountSetupController.swift in Sources */ = {isa = PBXBuildFile; fileRef = AEE56D752253431E007DC082 /* AccountSetupController.swift */; };
 		AEE56D7D2253ADB4007DC082 /* HudHandler.swift in Sources */ = {isa = PBXBuildFile; fileRef = AEE56D7C2253ADB4007DC082 /* HudHandler.swift */; };
 		AEE56D80225504DB007DC082 /* Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = AEE56D7F225504DB007DC082 /* Extensions.swift */; };
@@ -378,7 +377,6 @@
 		AEACE2DE1FB3246400DCDD78 /* Message.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Message.swift; sourceTree = "<group>"; };
 		AEACE2E21FB32B5C00DCDD78 /* Constants.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Constants.swift; sourceTree = "<group>"; };
 		AEACE2E41FB32E1900DCDD78 /* Utils.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Utils.swift; sourceTree = "<group>"; };
-		AEC679E9241A906C007DDBE1 /* UINavigationController+Extension.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UINavigationController+Extension.swift"; sourceTree = "<group>"; };
 		AEE56D752253431E007DC082 /* AccountSetupController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AccountSetupController.swift; sourceTree = "<group>"; tabWidth = 4; };
 		AEE56D7C2253ADB4007DC082 /* HudHandler.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = HudHandler.swift; sourceTree = "<group>"; };
 		AEE56D7F225504DB007DC082 /* Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Extensions.swift; sourceTree = "<group>"; };
@@ -473,7 +471,6 @@
 				3059620D234614E700C80F33 /* DcContact+Extension.swift */,
 				3059620F2346154D00C80F33 /* String+Extension.swift */,
 				302B84CD2397F6CD001C261F /* URL+Extension.swift */,
-				AEC679E9241A906C007DDBE1 /* UINavigationController+Extension.swift */,
 			);
 			path = Extensions;
 			sourceTree = "<group>";
@@ -1137,7 +1134,6 @@
 				305961FA2346125100C80F33 /* MessageReusableView.swift in Sources */,
 				3040F462234F550300FA34D5 /* AudioPlayerView.swift in Sources */,
 				AE52EA19229EB53C00C586C9 /* ContactDetailHeader.swift in Sources */,
-				AEC679EA241A906C007DDBE1 /* UINavigationController+Extension.swift in Sources */,
 				78E45E4421D3F14A00D4B15E /* UIImage+Extension.swift in Sources */,
 				3040F460234F419400FA34D5 /* BasicAudioController.swift in Sources */,
 				305962082346125100C80F33 /* MediaMessageSizeCalculator.swift in Sources */,

deltachat-ios/AppDelegate.swift

@@ -73,6 +73,11 @@ class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterD
         guard let window = window else {
             fatalError("window was nil in app delegate")
         }
+        if #available(iOS 13.0, *) {
+            window.backgroundColor = UIColor.systemBackground
+        } else {
+            window.backgroundColor = UIColor.white
+        }
         // setup deltachat core context
         //       - second param remains nil (user data for more than one mailbox)
         open()

deltachat-ios/Coordinator/AppCoordinator.swift

@@ -22,7 +22,6 @@ class AppCoordinator: NSObject, Coordinator {
     private lazy var loginController: UIViewController = {
         let accountSetupController = AccountSetupController(dcContext: dcContext, editView: false)
         let nav = UINavigationController(rootViewController: accountSetupController)
-        nav.dcStyle()
         let coordinator = AccountSetupCoordinator(dcContext: dcContext, navigationController: nav)
         coordinator.onLoginSuccess = presentTabBarController
         childCoordinators.append(coordinator)
@@ -35,7 +34,6 @@ class AppCoordinator: NSObject, Coordinator {
     private lazy var qrController: UIViewController = {
         let controller = QrViewController(dcContext: dcContext)
         let nav = UINavigationController(rootViewController: controller)
-        nav.dcStyle()
         let settingsImage = UIImage(named: "qr_code")
         nav.tabBarItem = UITabBarItem(title: String.localized("qr_code"), image: settingsImage, tag: qrTab)
         let coordinator = QrViewCoordinator(navigationController: nav)
@@ -47,7 +45,6 @@ class AppCoordinator: NSObject, Coordinator {
     private lazy var chatListController: UIViewController = {
         let controller = ChatListController(dcContext: dcContext, showArchive: false)
         let nav = UINavigationController(rootViewController: controller)
-        nav.dcStyle()
         let settingsImage = UIImage(named: "ic_chat")
         nav.tabBarItem = UITabBarItem(title: String.localized("pref_chats"), image: settingsImage, tag: chatsTab)
         let coordinator = ChatListCoordinator(dcContext: dcContext, navigationController: nav)
@@ -59,7 +56,6 @@ class AppCoordinator: NSObject, Coordinator {
     private lazy var settingsController: UIViewController = {
         let controller = SettingsViewController(dcContext: dcContext)
         let nav = UINavigationController(rootViewController: controller)
-        nav.dcStyle()
         let settingsImage = UIImage(named: "settings")
         nav.tabBarItem = UITabBarItem(title: String.localized("menu_settings"), image: settingsImage, tag: settingsTab)
         let coordinator = SettingsCoordinator(dcContext: dcContext, navigationController: nav)

deltachat-ios/Extensions/UINavigationController+Extension.swift

@@ -1,7 +0,0 @@
-import UIKit
-
-extension UINavigationController {
-    func dcStyle() {
-        navigationBar.isTranslucent = false
-    }
-}