[Lazarus] TStringGrid.AutoSizeColumns leads to temporary ghost columns

[Jürgen Hestermann]

> But on another machine (WinXP SP2) the most right column is still
> visible at its original place after AutoSizing so I see it twice.
> Toggling to another program and back with Alt+TAB lets it disappear.
>
It seems that his only happens when the number of lines fits within the 
current window.
If there are more lines then this does not happen.