When pulling InfiniteContainer the item inside disappears

[plumberg]

Describe the bug
In Android devices, if your InfiniteContainer contains only one item, when you pull the container "to refresh" fast enough, the item disappears from the screen for a couple of seconds.
This is not an issue for simulator and iPhone. Also I wasn't able to see this issue with 2+ items in the container.

To Reproduce
Steps to reproduce the behavior:

1. Create and add InfiniteContainer with single listing to your app.
2. Build and run it on Android device
3. Try to pull the container fast, maybe a couple of times.
4. See how the listing disappears from the screen.

Expected behavior
The listing should remain in container, on the display.

Smartphone (please complete the following information):

• Device: Motorola
• OS: Android 10 API29 and Android 7

[DurankGts]

I think that this is the same issue with the tensile drag that don't disable in the ContainerList some times. Why? I don't know...

ContainerList.issue.mp4

[DurankGts]

this a simple test case

     Form hi = new Form("Container issue", new BorderLayout());
     hi.setUIID("MyForm");
     hi.setSafeArea(true);
     hi.setFormBottomPaddingEditingMode(true);
     hi.setScrollableY(false);

    listChat = new Container(BoxLayout.y());
    listChat.setAlwaysTensile(false);
    listChat.setTensileDragEnabled(false);
    listChat.setTensileLength(0);
    listChat.setScrollableY(true);
    listChat.setScrollVisible(false);
    hi.add(BorderLayout.CENTER, listChat);
    hi.add(BorderLayout.SOUTH, new TextField("", "write here..."));
    hi.show();
    updateContainerList();

private void updateContainerList(){
    for (int i=0;i<100;i++ ) {
        Label l  = new Label("item: "+i);
        Container item = BorderLayout.center(l);
        listChat.addComponent(i,item);
    }
    listChat.revalidate();
}

this other video

android:9
alcatel 5024A

ContainerList.issue_2.mp4

[DurankGts]

the issue is when you tensile drag the Container list from Bottom to TOP. The tensile drag method just work when the user tensile drag from TOP to Bottom

[DurankGts]

this same issue occur in iphone xs ios 14.7.1

ContainerList.issue_iphone.mp4

[plumberg]

the issue is when you tensile drag the Container list from Bottom to TOP.

Yes, I believe I had this bug when I dragged list from the Bottom to the Top too, so it's no just if you pull it fast like in my original post.

[DurankGts]

@shannah you can reproduce the same behaivor in android, iphone and simultor. Dragging the list from bottom to TOP many times. Next the item in the list disappears.

[DurankGts]

Please @shannah help me with this issue...I create a test case