Resume devicewatcher after suspending (#1819)

Author: gave92

Files/App.xaml.cs

@@ -79,6 +79,7 @@ private void OnLeavingBackground(object sender, LeavingBackgroundEventArgs e)
         {
             // Need to reinitialize AppService when app is resuming
             InitializeAppServiceConnection();
+            AppSettings?.DrivesManager?.StartDeviceWatcher();
         }
 
         public static AppServiceConnection Connection;

Files/Filesystem/Drives.cs

@@ -50,8 +50,9 @@ private async void EnumerateDrives()
             };
         }
 
-        private void StartDeviceWatcher()
+        public void StartDeviceWatcher()
         {
+            this.Dispose();
             _deviceWatcher = DeviceInformation.CreateWatcher(StorageDevice.GetDeviceSelector());
             _deviceWatcher.Added += DeviceAdded;
             _deviceWatcher.Removed += DeviceRemoved;