Best practice for adding a item to a core-list data model when grouped.

[Daniel Chin]

Hi Guys

I am trying to add a item to a core-list when using groups. All is great when first initialised and render of the grouped data-set. The problem is when I want to add a new item, The grouping is setup using a nested data array ( list[ [item1,item2] ] )

When it is time to add a new item I simply try this approach list[0].push(newItem) to add the item to the end of the first group. What I am noticing is that an item jumps up from the second group into that position not the item I intended to add

I am unsure if this is a issue or if there is a best method of adding items to core-list when in group mode.

Regards

Daniel. 

[Daniel Chin]

After further investigations it seems to be duping the last item in the same group or from a group below if there is a large amount of groups within the data-set. Also tried to splice to add the item to the start of the group but this produced the same issue. 

[Rob Dodson]

Created an issue for this: https://github.com/Polymer/core-list/issues/75

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