[NUI] Fix ControlState equality issue. (#1795)

This patch fixes such code working well.
```
ControlState a = ControlState.Normal + ControlState.Selected;

a == ControlState.Selected; // This should be true.

```

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

diff --git a/src/Tizen.NUI/src/public/BaseComponents/ControlState.cs b/src/Tizen.NUI/src/public/BaseComponents/ControlState.cs
index 06aa976..c844f06 100644 (file)
--- a/src/Tizen.NUI/src/public/BaseComponents/ControlState.cs
+++ b/src/Tizen.NUI/src/public/BaseComponents/ControlState.cs
@@ -149,6 +149,11 @@ namespace Tizen.NUI.BaseComponents
 
             newState.stateList = newState.stateList.Distinct().ToList();
 
+            if (newState.stateList.Count == 1)
+            {
+                return newState.stateList[0];
+            }
+
             return newState;
         }