Fix Taskcanceledexception on close(?)

Author: RevoLand

CHANGELOG.md

@@ -28,6 +28,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - "Remove from SLM" Context Menu Item not working with created Origin libraries
 - Checking for library existence for SLM libraries not working as intended.
 - Showing Steam failover images for Origin games in List View if the image is not loaded correctly.
+- Disk Space with Mounted Volumes ([#72](https://github.com/RevoLand/Steam-Library-Manager/issues/72))
 
 ## [1.5.1.10] - 2019-07-17
 

Source/Steam Library Manager/Forms/Main.xaml.cs

@@ -221,6 +221,7 @@ private async void MainForm_ClosingAsync(object sender, System.ComponentModel.Ca
 
             Functions.SLM.OnClosing();
             Application.Current.Shutdown();
+            Environment.Exit(0);
         }
 
         public void LibraryCMenuItem_Click(object sender, RoutedEventArgs e) => ((Definitions.Library)(sender as MenuItem)?.DataContext)?.ParseMenuItemActionAsync((string)((MenuItem)sender)?.Tag);