Asks the GtkTreeDragDest to insert a row before the path dest,
deriving the contents of the row from selection_data. 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!
Asks the GtkTreeDragDest to insert a row before the path dest, deriving the contents of the row from selection_data. 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!