Using Visible Within a List View Breaks UI

[Farmbot26]

The following code make items in the ListView with visible == true overlap and bunch up at the top.

`
ListView {

 for item[i] in items-model : HorizontalBox {

      visible: item.should_show;
      text: item.text;

 }

}
`

[ogoffart]

I can reproduce the problem:

Full testcase

[ogoffart]

I created #2537 to track the bug

[ogoffart]

FYI, I added a workaround in #2537 (comment)