PrefixSelectionComboBox doesn't work with NUMPAD

Issue #836 resolved
Abhinay Agarwal
created an issue

PrefixSelectionComboBox doesn't work when NUMPAD keys are pressed. This is an issue that has always existed.

The reason behind the issue is the way it extracts the letter/text of the key pressed. The control uses KeyCode#impl_getChar() to get the key code, which works for most of the keys but not all.

The correct way to get the text would be to use KeyEvent#getText.