Comment 3 for bug 1467886

I think the problem is that the documentation doesn't match what the code does.

The internal documentation we have in the code says

    This widget shows a list of widgets defined in widgetData["widgets"]
    Those widgets can be collapsed or uncollapsed. When uncollapsed
    all the widgets are shown, when collapsed only the first
    widgetData["collapsed-widgets"] are shown. It has a title that comes
    in via widgetData["title"]. This widget expands all child widgets
    when initialized by specifying widgetData["expanded"] == true.
    It's in unexpanded mode by default.

There's nothing about 0 being a magic number and also collapsed-widgets is the number of widgets that will still be shown when the widget is collapsed.

I think it's best to update the documentation to match the code since there's a few scopes using the widget already.