item must be of type
GListStore:item-type or derived from it.
position must be smaller
than the length of the list, or equal to it to append.
This function takes a ref on
g_list_store_splice() to insert multiple items at the same time efficiently.
Available since: 2.44
The position at which to insert the new item.
The new item.
The data is owned by the caller of the function.