c_gtk_tree_view_enable_model_drag_dest

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)
void function(GtkTreeView* treeView, GdkContentFormats* formats, GdkDragAction actions) c_gtk_tree_view_enable_model_drag_dest;

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