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fadeIn blinks when entering

See original GitHub issue

I’m using a tween AnimationSpec so that I can slow the transition down to highlight the problem, but it also occurs with the other AnimationSpecs. The other EnterTransitions work fine (slideIn, etc…).

test

(The GIF has some artifacting from ffmpeg)

fun main() {
  val visible = mutableStateOf(true)

  GlobalScope.launch {
    while(true) {
      delay(2500)
      visible.value = false
      delay(2500)
      visible.value = true
    }
  }

  Window(
      title = "Test"
  ) {
    MaterialTheme {
      Box(
          modifier = Modifier.fillMaxSize()
      ) {
        Test(visible)
      }
    }
  }
}

@ExperimentalAnimationApi
@Composable
fun Test(visible: State<Boolean>) {
  AnimatedVisibility(
      visible = visible.value,
      initiallyVisible = !visible.value,
      enter = fadeIn(
          animationSpec = tween(durationMillis = 1500)
      ),
      exit = fadeOut(
          animationSpec = tween(durationMillis = 1500)
      )
  ) {
    Surface(
        modifier = Modifier.fillMaxSize()
    ) {
      Text(
          "Test",
          modifier = Modifier.fillMaxSize(),
          textAlign = TextAlign.Center
      )
    }
  }
}