Add tabindex -1 into newly created form if attr not present and remove attr from old forms on blur event, if not present previously. Always scroll and then focus on the element.
Adds the child’s count next to its heading label, ignoring deleted items.
Update states of listing controls in response to a change of state such as adding, deleting or moving an element.
Update fields based on the current DOM order.
Attaches behaviour for an InlinePanel where inner panels can be created, removed and re-ordered.
Param: opts
Param: opts.formsetPrefix
Param: opts.canOrder
Param: opts.emptyChildFormPrefix
Param: opts.maxForms
Param: opts.onAdd
Returns