gtk:tree-drag-source-drag-data-get (source path data)

source -- a gtk:tree-drag-source object
path -- a gtk:tree-path insance with the row that was dragged
data -- a gtk:selection-data instance to fill with data from the dragged row

True if data of the required type was provided.

Asks the gtk:tree-drag-source object to fill in data with a representation of the row at path. The gtk:selection-data-target function gives the required type of the data. Should robustly handle a path no longer found in the model.