I have developed my own subclass of TextField and it uses a skin class which is its own subclass of TextFieldSkin. At some point I register the skin like this

setSkin(new MyTextFieldSkin())

This works just fine. However, this line of code is part of a larger method, and in some cases that method may be executed more than once during an execution of my app. This effectively means I instantiate a new MyTextFieldSkin and assigns it to the TextField, replacing the existing MyTextFieldSkin.

And this is where I have discovered a bug. After setting the skin twice any keyboard input to the TextField is registered twice, so typing the K key adds the characters "kk" to the TextField contents. This is consistent, so if I run this code

setSkin(new MyTextFieldSkin())
setSkin(new MyTextFieldSkin())
setSkin(new MyTextFieldSkin())

and then type the P key once, I get "ppp" – three P's, one for each skin. I am guessing the setSkin method forgets to unregister the previous skin.

I do not have the time to build a seperate test app which illustrates the bug, but do not hessitate to ask any questions you might have.