Decide how to use `echo_char` in `getpass.fallback_getpass`

Hello everyone, I am a Chinese high school student. This is my first contribution to cpython on GitHub. If there are any errors, please kindly point them out. Thank you!
I noticed that in the getpass library of Python 3.14, there was a seemingly useless function call in fallback_getpass: _check_echo. This function was originally designed to check if the echo character is valid, but I think this call is redundant because:

1. fallback_getpass is only called when the terminal settings cannot be controlled, and the echo_char parameter actually does not work properly at this time
   2.In a fallback scenario, even if echo_char is provided, password echo control cannot be implemented
   I suggest removing this unnecessary call. Modify the code as follows:

def fallback_getpass(prompt='Password: ', stream=None, *, echo_char=None):
    # remove the function call
    import warnings
    warnings.warn("Can not control echo on the terminal.", GetPassWarning,
                  stacklevel=2)
    if not stream:
        stream = sys.stderr
    print("Warning: Password input may be echoed.", file=stream)
    return _raw_input(prompt, stream, echo_char=echo_char)

By the way,can we make IDLE support getpass?I think it is important for the beginners!

At last,if I say something wrong, please tell me why and forgive me, thank you!

Start with the getpass.fallback_getpass entry point and inspect how it calls _check_echo and handles echo_char when terminal settings cannot be controlled. Determine whether the validation call is needed in this fallback path, and confirm the chosen behavior with the relevant getpass behavior checks.