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Fix transfer annotation for tree_model parameter of gtk_tree_get_row_drag_data() and add nullable, optional The GtkSelectionData does not own the model set with gtk_tree_set_row_drag_data so change the out param to "transfer none". This fixes a crash after multiple DnD actions due to the bindings stealing a reference each time this function is called. This also adds nullable and optional annotations for tree_model and path while at it. https://bugzilla.gnome.org/show_bug.cgi?id=743193
f4dee9b6
