Inserts a new row before sibling.
If sibling is null, then the row will be appended to parent ’s children.
If parent and sibling are null, then the row will be appended to the toplevel.
If both sibling and parent are set, then parent must be the parent of sibling. When
sibling is set, parent is optional.
iter will be changed to point to this new row. The row will be empty after this function is called. To fill in values, you
need to call @set or set_value
.
| this |
A `GtkTreeStore` |
| iter |
An unset `GtkTreeIter` to set to the new row |
| parent |
A valid `GtkTreeIter` |
| sibling |
A valid `GtkTreeIter` |