Make sure Fonts are disposed (need to free textures!)

Vocaluxe/Base/Fonts/CFont.cs

@@ -34,6 +34,8 @@ namespace Vocaluxe.Base.Fonts
 
         private readonly string _FilePath;
 
+        private bool _Disposed;
+
         public CFont(string file)
         {
             _FilePath = file;
@@ -135,11 +137,12 @@ namespace Vocaluxe.Base.Fonts
 
         public void Dispose()
         {
-            if (_Fonts != null)
+            if (!_Disposed)
             {
-                _Fonts.Dispose();
+                if (_Fonts != null)
-                _Fonts = null;
+                    _Fonts.Dispose();
                 UnloadGlyphs();
+                _Disposed = true;
             }
             GC.SuppressFinalize(this);
         }

Vocaluxe/Base/Fonts/CFonts.cs

@@ -31,11 +31,13 @@ namespace Vocaluxe.Base.Fonts
     {
         private static readonly XmlWriterSettings _Settings = new XmlWriterSettings();
 
-        private static List<SFont> _Fonts;
+        private static readonly List<SFont> _Fonts = new List<SFont>();
         private static int _CurrentFont;
         private static float _Height = 1f;
 
+        // ReSharper disable MemberCanBePrivate.Global
         public static int PartyModeID { get; set; }
+        // ReSharper restore MemberCanBePrivate.Global
 
         public static EStyle Style = EStyle.Normal;
 
@@ -68,7 +70,14 @@ namespace Vocaluxe.Base.Fonts
 
         private static void _BuildFonts()
         {
-            _Fonts = new List<SFont>();
+            foreach (var font in _Fonts)
+            {
+                font.Normal.Dispose();
+                font.Bold.Dispose();
+                font.Italic.Dispose();
+                font.BoldItalic.Dispose();
+            }
+            _Fonts.Clear();
             _CurrentFont = 0;
 
             _LoadFontList();
@@ -344,8 +353,6 @@ namespace Vocaluxe.Base.Fonts
             if (xmlReader == null)
                 return;
 
-            _Fonts.Clear();
-
             _LoadFontFiles(xmlReader, Path.Combine(Directory.GetCurrentDirectory(), CSettings.FolderFonts));
         }