Fix GC finalizer issue

 - Finalizer was called in GC thread and it can't access EFL object
 - Remove all finalizer code that access EFL object
 - Hold the reference of EvasObject that was added on Window
 - Fix wrong IDispose implemention
   - When Dispose(false) native handle should be freed,
     but we didn't, it cause seg-fault, after released C# layer, native callback can invoked.
   - So, We release native handle when Dispose(false) was called.
   - but, it will cause some error message 'Maybe it has already been freed.'

Change-Id: Ic225799ac8cf9fd102a67d870043cb24bad55c7d

1 files changed, 8 insertions, 5 deletions

diff --git a/ElmSharp/ElmSharp/ItemObject.cs b/ElmSharp/ElmSharp/ItemObject.cs
index e8c9be7..a3cc6e2 100644
--- a/ElmSharp/ElmSharp/ItemObject.cs
+++ b/ElmSharp/ElmSharp/ItemObject.cs
@@ -23,11 +23,14 @@ namespace ElmSharp
             Handle = handle;
         }
 
-        ~ItemObject()
-        {
-            if (Handle != IntPtr.Zero)
-                Interop.Elementary.elm_object_item_del(Handle);
-        }
+        // C# Finalizer was called on GC thread
+        // So, We can't access to EFL object
+        // And When Finalizer was called, Field can be already released.
+        //~ItemObject()
+        //{
+        //    if (Handle != IntPtr.Zero)
+        //        Interop.Elementary.elm_object_item_del(Handle);
+        //}
 
         public int Id { get; private set; }