[BUG] NGUI 3.6.2 UIInput multi-line text and HideInput on Mobile

[Tripwire]

Hi,

I think I found a bug in the latest version of NGUI (3.6.2). When setting the keyboard type to HideInput on a textfield with multiple lines, it still shows the inputfield above the keyboard but it isn't inputting anything there just in the textfield where it should be.

Steps to reproduce:
1. Create a Textfield with multiple lines
2. On the UIInput set the keyboard type to HideInput
3. Run it on your mobile device (I used the iPhone 5s)

EDIT:
It seems that Unity3D doesn't support hiding the Inputfield above the keyboard when using multi-line textfields:
http://docs.unity3d.com/ScriptReference/TouchScreenKeyboard-hideInput.html

[ArenMook]

Add a check for this on line 539 of UIInput.cs. It's currently just checking for keyboardType being KeyboardType.HideInput. Change it to include the multiline check as well:

1. if (keyboardType == KeyboardType.HiddenInput && !label.multiLine)