This function is equivalent to gtk_drag_begin_with_coordinates(), passing -1, -1 as coordinates.
The targets (data formats) in which the source can provide the data
A bitmask of the allowed drag actions for this drag
The button the user clicked to start the drag
The event that triggered the start of the drag, or NULL if none can be obtained.
the context for this drag
Deprecated: Use gtk_drag_begin_with_coordinates() instead