IssueTracker

I need to modify text (make it first-word uppercased). I have created the mutablestate and make the processing in onValueChange function. But when I type the letters, input text combines old value and transformed value. For example, if the code changes input to lowercase, state is changed in that sequence (typing "test"):
- t
- tte
- ttettes
- ttettesttettest

Sample code to reproduce:

@Composable
fun TestView() {
            val (login,setLogin) = remember { mutableStateOf(TextFieldValue("")) }
            TextField(login, onValueChange = {
                setLogin(TextFieldValue(it.text.toLowerCase(), it.selection))
            })
}

I've tried also make the state with string value (remember { mutableStateOf("") }), but there was same behaviour.
Jetpack Compose v1.0.0-alpha-05