We should have a better handling of `scroll_x` when executing `do_backspace` method from TextInput about kivy

[ElliotGarbus]

@FilipeMarch Here is a workaround.

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.textinput import TextInput
from kivy.properties import NumericProperty

kv = """
AnchorLayout:
    ScrollBackTextInput:
        size_hint: None, None
        size: dp(150), dp(30)
        multiline: False
        scroll_back: self.width - 20  # scroll back is related to the size of the text box
"""


class ScrollBackTextInput(TextInput):
    scroll_back = NumericProperty(90)

    def on_text(self, *args):
        if self.x + self.padding[0] >= self.cursor_pos[0]:
            # cursor is on left hand side, padding[0] is padding on the left
            # if the cursor hits the left hand side, scroll to the left
            self.scroll_x = max(0, self.scroll_x - self.scroll_back)


class TiTestApp(App):
    def build(self):
        return Builder.load_string(kv)


TiTestApp().run()

[Julian-O]

Closing as duplicate of #4951.

If you think this is in error, please let us know.