// needed for longlistMULTIselector only
private void ScrollToPreviousLongListPosition()
{
var item = AppModel.CurrentScrollPosition();
if (item != null)
{
// Trying to scroll to a nonexistent list item fails with an ArgumentException, so we suppress.
// However, by checking MusicItems.Contains as above, this should never happen.
// The item we try to scroll to may have been deleted, or the library may have been reset.
// We could try to check whether the item exists in the selector, but it's not too easy.
// Directly searching LongListSelector.ItemsSource will not work, because the items may be grouped.
Utils.Suppress <Exception>(() => MusicItemLongListSelector.ScrollTo(item));
}
}
