move_after
Description:
Moves iter in this to the position after position.
Note:
Use [class@Gtk.TreeListModel] instead
iter and position should be in the same level.
Note that this function only works with unsorted stores.
If position is null, iter will be moved to the start of the level.
Parameters:
| this |
A `GtkTreeStore` |
| iter |
A `GtkTreeIter`. |
| position |
A `GtkTreeIter`. |