Hack to get F12 working on Linux

src/Gtk/Perspex.Gtk/Input/GtkKeyboardDevice.cs

@@ -7,15 +7,25 @@
 namespace Perspex.Gtk
 {
     using System;
+    using System.Collections.Generic;
+    using System.Reflection;
     using Perspex.Input;
-
+    
     public class GtkKeyboardDevice : KeyboardDevice
     {
         private static GtkKeyboardDevice instance;
+        private static readonly Dictionary<Gdk.Key, string> NameDic = new Dictionary<Gdk.Key, string>();
 
         static GtkKeyboardDevice()
         {
             instance = new GtkKeyboardDevice();
+            foreach (var f in typeof (Gdk.Key).GetFields(BindingFlags.Public | BindingFlags.Static))
+            {
+                var key = (Gdk.Key) f.GetValue(null);
+                if(NameDic.ContainsKey(key))
+                    continue;
+                NameDic[key] = f.Name;
+            }
         }
 
         private GtkKeyboardDevice()
@@ -36,7 +46,9 @@ namespace Perspex.Gtk
             }
             else
             {
-                var s = Enum.GetName(typeof(Gdk.Key), key);
+                string s;
+                if (!NameDic.TryGetValue(key, out s))
+                    s = "Unknown";
                 Perspex.Input.Key result;
 
                 if (Enum.TryParse(s, true, out result))