Backspace in TextInput on android does not work with on_text_validate method

[Neizvestnyj]

Software Versions

• Python: 3.10
• OS: Android
• Kivy: 2.2.0
• Kivy installation method: pip

When we try to delete a character after the on_text_validate method is triggered, it is impossible to erase the characters in the text field, but I found out that its triggering is optional, it is enough to defocus the field with this method.

from kivy.app import App
from kivy.core.window import Window
from kivy.lang.builder import Builder

Window.keyboard_anim_args = {'d': .25, 't': 'in_out_expo'}
Window.softinput_mode = "below_target"

KV = """
BoxLayout:
    orientation: 'vertical'
    spacing: dp(10)
    padding: dp(10)
    
    TextInput:
        id: first
        hint_text: 'Simple text input'
        
    TextInput:
        id: first
        hint_text: 'Text input with `on_text_validate` method'
        on_text_validate: self.focus = False
        
    TextInput: # <- BUG
        id: first
        hint_text: 'Text input with `on_text_validate` method and `multiline: False`'
        on_text_validate: self.focus = False
        multiline: False
"""


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


TestApp().run()

DEMO.mp4

[misl6]

I guess we have another issue to place into the list for #8226 😅

Added. Thank you for reporting.