[NUI] Call RemoveWidget when WidgetView is disposed

when WidgetView is disposed, RemoveWidget must be called.
so i added this patch

diff --git a/src/Tizen.NUI/src/public/Widget/WidgetView.cs b/src/Tizen.NUI/src/public/Widget/WidgetView.cs
index 44fc35f..a36e247 100755 (executable)
--- a/src/Tizen.NUI/src/public/Widget/WidgetView.cs
+++ b/src/Tizen.NUI/src/public/Widget/WidgetView.cs
@@ -639,6 +639,9 @@ namespace Tizen.NUI
                 return;
             }
 
+            //Remove Widget from WidgetViewManager
+            WidgetViewManager.Instance.RemoveWidget(this);
+
             //Release your own unmanaged resources here.
             //You should not access any managed member here except static instance.
             //because the execution order of Finalizes is non-deterministic.