anchor.diff:            w := FindWindowByBackupHandle(ev.xconfigure.window);
             if not Assigned(w) then
               ReportLostWindow(ev);
  -            
  +
             if w <> nil then
             begin
               if w.FWindowType <> wtChild then
  
positive.code:   // According to a comment in X.h, the valid event types start with 2!
    if ev._type < 2 then
      exit;
      
  
    Popup := PopupListFirst;
  
  
negative.code: 
    IconPixmap: TPixmap;
    WMHints: PXWMHints;
  
    prop: TAtom;
    mwmhints: TMWMHints;
  begin
  