c_gtk_tree_drag_source_drag_data_get

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
int function(GtkTreeDragSource* dragSource, GtkTreePath* path, GtkSelectionData* selectionData) c_gtk_tree_drag_source_drag_data_get;

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