canui.List add elements not only at the end

Now elements in {data} add event only added in the end


rowElements.last().after(newRows);


it would be better to determine index where elements where added

var index = list.indexOf(observes[0]) - 1;
if (index == -1) rowElements.first().before(newRows)
else
rowElements.eq(index).after(newRows);


Start at the canui.List handling for add events on {data}, using the shown rowElements and list operations as the entry point. Trace how the added elements are identified and verify that new rows are inserted at their corresponding index rather than always appended; done means additions at the beginning, middle, and end appear in the correct order.

Written by the indexing model from the issue text.