Add a IsTweetDeckWebsite bool to ITweetDeckBrowser

Core/ITweetDeckBrowser.cs

@@ -3,6 +3,8 @@
 
 namespace TweetDuck.Core{
     interface ITweetDeckBrowser{
+        bool IsTweetDeckWebsite { get; }
+
         void RegisterBridge(string name, object obj);
         void OnFrameLoaded(Action<IFrame> callback);
         void ExecuteFunction(string name, params object[] args);

Core/Notification/FormNotificationMain.cs

@@ -92,6 +92,10 @@ protected FormNotificationMain(FormBrowser owner, PluginManager pluginManager, b
             Disposed += (sender, args) => StopMouseHook(true);
         }
 
+        // implementation of ITweetDeckBrowser
+
+        bool ITweetDeckBrowser.IsTweetDeckWebsite => IsNotificationVisible;
+
         void ITweetDeckBrowser.RegisterBridge(string name, object obj){
             browser.RegisterAsyncJsObject(name, obj);
         }

Core/TweetDeckBrowser.cs

@@ -22,6 +22,10 @@ public bool Enabled{
 
         public bool IsTweetDeckWebsite{
             get{
+                if (!Ready){
+                    return false;
+                }
+
                 using(IFrame frame = browser.GetBrowser().MainFrame){
                     return TwitterUtils.IsTweetDeckWebsite(frame);
                 }