Backspace doesn't work correctly if input_type is set to "number"

[DexerBR]

Software Versions

• Python: 3.9.9 / 3.8.9
• OS: Ubuntu 20.04 (WSL2)
• Kivy: 2.1.0 / master
• Kivy installation method: through buildozer (kivy==2.1.0, kivy==master)
• Buildozer: 1.5.0
• python-for-android: v2023.02.10
• Device: Amazon Fire Tablet 8 10th gen

Describe the bug

When setting the input_type to number ( in the described environment), the backspace stops working correctly if there is a initial text. It seems that the starting character count is stuck, and in some cases this stuck character count seems to increase or decrease.

I also tested the datetime and tel options, and the behavior is the same.

Expected behavior
Backspace should work correctly

To Reproduce

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


KV = """
BoxLayout:
    TextInput:
        text: "12"
        input_type: "number"
"""


class TestApp(App):
    def build(self):
        return Builder.load_string(KV)


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

Code and Logs and screenshots

record_20230503_181003_033514.mp4

[misl6]

Yeah, I guess we can add this issue to #8226 "related issues" long list.

[afriddev]

Upgrade The version