input_dialog validation issues

Hi,

when using input_dialog validation there is a bug where text validation does not occur upon clicking the OK button (With mouse or keyboard).

My suggested solution to fix this issue is to change the ok_handler method of the input_dialog so :

1. A new validation will occur upon clicking on the OK button
2. In case of validation error that focus will be brought back to the TextArea control

def ok_handler() -> None:
        textfield.buffer.validate() # ---------> Perform validation
        if textfield.buffer.validation_error is None: # ---------> Check for validation errors
            get_app().exit(result=textfield.text)
        else:
            get_app().layout.focus(textfield) # -------------> Bring back the focus to the TextArea control

Thanks in advance :)

Locate the input_dialog implementation and its ok_handler entry point, then inspect how the TextArea buffer currently validates on submission. Done means clicking OK with either mouse or keyboard triggers validation, returns the text only when valid, and restores focus to the TextArea after a validation error.