Starts a drag and creates a new drag context for it.
This function is called by the drag source.
the source window for this drag
the device that controls this drag
the offered targets, as list of #GdkAtoms
the x coordinate where the drag nominally started
the y coordinate where the drag nominally started
a newly created #GdkDragContext
3.20
See Implementation
Starts a drag and creates a new drag context for it.
This function is called by the drag source.