Delete item from QMap<int, QString> with shift

[tbscope]

For example I want that after map.remove element with index 2 replace your index to 1..

You you please explain this a little bit better?

Do you want to remove the item at index 2? The item at index 2 is the item with key = "3" and value = "some3".
And do you want the item at index 2 to be replaced by the item at index 1?