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qt'QExpandingLineEdit (./qt-2.1.0/src/dialogs/qfontdialog.cpp:109)

class QExpandingLineEdit : public QLineEdit
{
public:
    QExpandingLineEdit( QWidget *parent, const char *name, bool fixedHeight )
	: QLineEdit( parent, name ) { f = fixedHeight; }
    QSizePolicy sizePolicy() const
    {
	    return QSizePolicy( QSizePolicy::Expanding,
				f ? QSizePolicy::Fixed :
				    QSizePolicy::Expanding  );
    }
    QSize sizeHint() const { QSize sz = QLineEdit::sizeHint();
                             sz.setWidth( 20 );
			     return sz;
                           }
    bool f;
};