finish auto-hide

QuickLook.Plugin/QuickLook.Plugin.ImageViewer/Plugin.cs

@@ -64,8 +64,7 @@ namespace QuickLook.Plugin.ImageViewer
                 context.PreferredSize = new Size(1024, 768);
 
             Directory.SetCurrentDirectory(App.AppPath);
-
-            context.AutoHideTitlebar = true;
+            
             context.TitlebarOverlap = true;
         }