Fix unhandled UnauthorizedAccessException causing crash while listing… (#1025)

* Fix unhandled UnauthorizedAccessException causing crash while listing directories

* Actually handle not having privileges for a directory

* Fix log message when not having privileges for a directory

* Remove unneccesary empty lines

* Remove unneccecssary space

Ryujinx/Ui/ApplicationLibrary.cs

@@ -40,6 +40,47 @@ namespace Ryujinx.Ui
         private static Language          _desiredTitleLanguage;
         private static bool              _loadingError;
 
+        public static IEnumerable<string> GetFilesInDirectory(string directory)
+        {
+            Stack<string> stack = new Stack<string>();
+            stack.Push(directory);
+            while (stack.Count > 0)
+            {
+                string dir = stack.Pop();
+                string[] content = { };
+
+                try
+                {
+                    content = Directory.GetFiles(dir, "*");
+                }
+                catch (UnauthorizedAccessException)
+                {
+                    Logger.PrintWarning(LogClass.Application, $"Failed to get access to directory: \"{dir}\"");
+                }
+
+                if (content.Length > 0)
+                {
+                    foreach (string file in content)
+                        yield return file;
+                }
+
+                try
+                {
+                    content = Directory.GetDirectories(dir);
+                }
+                catch (UnauthorizedAccessException)
+                {
+                    Logger.PrintWarning(LogClass.Application, $"Failed to get access to directory: \"{dir}\"");
+                }
+
+                if (content.Length > 0)
+                {
+                    foreach (string subdir in content)
+                        stack.Push(subdir);
+                }
+            }
+        }
+
         public static void LoadApplications(List<string> appDirs, VirtualFileSystem virtualFileSystem, Language desiredTitleLanguage)
         {
             int numApplicationsFound  = 0;
@@ -53,6 +94,7 @@ namespace Ryujinx.Ui
             List<string> applications = new List<string>();
             foreach (string appDir in appDirs)
             {
+                
                 if (!Directory.Exists(appDir))
                 {
                     Logger.PrintWarning(LogClass.Application, $"The \"game_dirs\" section in \"Config.json\" contains an invalid directory: \"{appDir}\"");
@@ -60,10 +102,10 @@ namespace Ryujinx.Ui
                     continue;
                 }
 
-                foreach (string app in Directory.GetFiles(appDir, "*.*", SearchOption.AllDirectories))
+                foreach (string app in GetFilesInDirectory(appDir))
                 {
                     if ((Path.GetExtension(app).ToLower() == ".nsp") ||
-                        (Path.GetExtension(app).ToLower() == ".pfs0")||
+                        (Path.GetExtension(app).ToLower() == ".pfs0") ||
                         (Path.GetExtension(app).ToLower() == ".xci") ||
                         (Path.GetExtension(app).ToLower() == ".nca") ||
                         (Path.GetExtension(app).ToLower() == ".nro") ||