[Lazarus] GTK2 GroupBox auto size

[Henry Vermaak]

Hi

The GroupBox auto size doesn't work very well, because it doesn't take
the label width into account.  If the label is wider than all of the
children, it will get clipped.  Any reason why GetGTKDefaultWidgetSize
wasn't used, like virtually everywhere else in gtk2wsstdctrls.pp?

I attach a patch that uses GetGTKDefaultWidgetSize.

Henry
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