insert
Description:
Inserts the widget into this at position.
If a sort function is set, the widget will actually be inserted at the calculated position.
If position is -1, or larger than the total number of children in the this, then the
widget will be appended to the end.
Parameters:
| this |
a `GtkFlowBox` |
| widget |
the `GtkWidget` to add |
| position |
the position to insert |