Matches the collapsed state for this groupbox.

def matchCollapsedState( self ):
        """
        Matches the collapsed state for this groupbox.
        """
        collapsed = not self.isChecked()
        if self._inverted:
            collapsed = not collapsed
        
        if ( not self.isCollapsible() or not collapsed ):
            for child in self.children():
                if ( not isinstance(child, QWidget) ):
                    continue
                
                child.show()
            
            self.setMaximumHeight(MAX_INT)
            self.adjustSize()
            
            if ( self.parent() ):
                self.parent().adjustSize()
        else:
            self.setMaximumHeight(self.collapsedHeight())
            
            for child in self.children():
                if ( not isinstance(child, QWidget) ):
                    continue
                
                child.hide()