gtk:tree-view-enable-model-drag-source (view mask formats actions)

view -- a gtk:tree-view widget
mask -- a gdk:modifier-type mask of allowed buttons to start drag
formts -- a gdk:conent-formats instance with the targt formats that the drag will support
actions -- a gdk:drag-action bitmask of possible actions for a drag from this widget

Turns the tree view into a drag source for automatic DND. Calling this method sets the reorderable property to the false value. The gtk:tree-view implementation is deprecated since 4.10. Please do not use it in newly written code.