drag_data_received
Description:
Asks the `GtkTreeDragDest` to insert a row before the path dest, deriving the contents of the row from value.
Note:
Use list models instead
If dest is outside the tree so that inserting before it is impossible, false will be returned.
Also, false may be returned if the new row is not created for some model-specific reason. Should robustly
handle a dest no longer found in the model!
Parameters:
| this |
a `GtkTreeDragDest` |
| dest |
row to drop in front of |
| value |
data to drop |
Returns:
|
whether a new row was created before position |