reproduce TextInput bug

main.py

__version__ = '0.9.0'
import kivy
from kivy.uix.textinput import TextInput
from kivy.app import App

class AutoComplete(TextInput):

    def __init__(self, **kwargs):
        super(AutoComplete, self).__init__(**kwargs)
        self.current_cursor = (0,0)
        self.char_buffer = ''

    def insert_text(self, substring, from_undo=False):
        super(AutoComplete, self).insert_text(substring + 'P')
        print 'TEXT IS: ', self.text, 'SUBSTRING IS:  ', substring
        return True

class TextInputApp(App):

    def __init__(self, **kwargs):
        super(TextInputApp, self).__init__(**kwargs)

    def build(self):
        return AutoComplete()

if __name__ == "__main__":
    TextInputApp().run()