Input.imeCompositionMode doesn't work in Unity5

I can set Input.imeCompositionMode to IMECompositionMode.On or IMECompositionMode.Off to explicitly enable or disable IME composition in Unity 4.x.
But in Unity5, This doesn't work.

A simple test script as follows:

Code (CSharp):

1.     public void Update()
2.     {
3.         if (Input.imeCompositionMode == IMECompositionMode.Auto)
4.         {
5.             mode.text = "Auto";
6.             return;
7.         }
8.  
9.         if (Input.imeCompositionMode == IMECompositionMode.On)
10.         {
11.             mode.text = "On";
12.             return;
13.         }
14.  
15.         if (Input.imeCompositionMode == IMECompositionMode.Off)
16.         {
17.             mode.text = "Off";
18.             return;
19.         }
20.     }
21.  
22.     public void OnGUI()
23.     {
24.         Event e = Event.current;
25.         if (e.isKey && e.keyCode != KeyCode.None)
26.         {
27.             Debug.LogError("Detected key code: " + e.keyCode + ";" + e.type + ";" + e.character);
28.         }
29.     }

In Unity5 with Input.imeCompositionMode setting to IMECompositionMode.Off, the IME inputting is still enabled, and I also tried IMECompositionMode.Auto, that doesn't work,either


While In Unity4.5, Input.imeCompositionMode works just fine.


Is there any solution to this problem? or it is a Unity 5 bug?
PS(UI in the Demo is NGUI 3.8)

 

I have the same problem, IMECompositionMode.Off doesn't work.

 

Any solutions found yet?