Scrollbar "fade out" does not work

[ThomasH99]

Describe the bug
I’m using the scrollbar but I cannot get it fade out smoothly/gradually, it just disappears abruptly.

The issue happened with a fadeout time of 1000 (1 second), but equally with 3000 (3s).

I don’t know if it’s important, but I also noticed that the scrollbar on the Simulator always stay visible, it only disappears on iOS and Android.

Here’s the code I call in init():

UIManager.getInstance().getLookAndFeel().setFadeScrollBar(true);
UIManager.getInstance().getLookAndFeel().setFadeScrollBarSpeed(1000); //milliseconds I assume

and my CSS:

scrollVisibleBool: true;
fadeScrollBarBool:true;

fadeScrollEdgeBool:false; /*not used I believe */
fadeScrollEdgeInt:0;

Scroll{
background: transparent;
color:transparent;
margin:0;
padding: 0 0 0 0.5mm;
}

ScrollThumb{ /*not used I believe */
cn1-derive:Scroll;
color:transparent;
padding: 0;
margin:0;
background: transparent;
}

To Reproduce
Add the code above to a Hello Word app's CSS and main.

Expected behavior
The scrollbar should fade out gradually instead of disappear instantly after a short time.

Desktop (please complete the following information):

• OS: iOS 17, Android 8.

Smartphone (please complete the following information):

• Device: [iPhone XR, Samsung Galaxy S7