when invoking the completer, instead of having to chose/dismiss, you can
continue typing, it will filter the result "as you type" and dismiss itself
if ther is no match left.
As it is now, it's only works with lowercase letters, I need to find a workaroud
if you type :
* it will propose PySide, but will dismiss when 'o' is pressed and pasting Pyso with a lower case 's'