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Exchange two items in the list
Source position: fgl.pp line 80
public procedure TFPSList.Exchange(  | 
Index1: Integer;  | 
Index2: Integer  | 
);  | 
Index1  | 
  | 
First item  | 
Index2  | 
  | 
Second item  | 
Exchange will exchange 2 items at positions Index1 and Index2 in the list.
If Index1 or Index2 are out of bounds, an EListError exception is raised.