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Source position: lazgtk3.pas line 14351
type TGtkTreeViewColumnDropFunc = function(  | 
tree_view: PGtkTreeView;  | 
column: PGtkTreeViewColumn;  | 
prev_column: PGtkTreeViewColumn;  | 
next_column: PGtkTreeViewColumn;  | 
data: gpointer  | 
):gboolean;  |