[NUI] Unparent view when Dispose() is called explicitly (#3392)

Signed-off-by: Jiyun Yang <ji.yang@samsung.com>

diff --git a/src/Tizen.NUI/src/public/BaseComponents/ViewInternal.cs b/src/Tizen.NUI/src/public/BaseComponents/ViewInternal.cs
index 408f779..26ccf54 100755 (executable)
--- a/src/Tizen.NUI/src/public/BaseComponents/ViewInternal.cs
+++ b/src/Tizen.NUI/src/public/BaseComponents/ViewInternal.cs
@@ -1230,6 +1230,8 @@ namespace Tizen.NUI.BaseComponents
                     heightConstraint.Remove();
                     heightConstraint.Dispose();
                 }
+
+                Unparent();
             }
 
             //Release your own unmanaged resources here.