wrap_problem.py

from kivy.app import App
from kivy.app import Builder

from kivy.uix.stacklayout import StackLayout
from kivy.uix.textinput import TextInput

Builder.load_string("""
<MyTextInput>:
    size_hint: 1, None
    font_size: 40
    padding: 50,0
""")
class MyTextInput(TextInput):
    pass

class Test(App):
    def build(self):
        root_layout = StackLayout()

        for i in xrange(6):
            root_layout.add_widget(MyTextInput(text="*this* goes off-view when typing here: "))

        return root_layout

    def increase_size(self, *args):
        self.my_unit += 1
        print self.my_unit

Test().run()

Current output:

fix pull request here: kivy/kivy#4453