code: def update_warning(self):
          
          widget = self._button_warning
          if not self.is_valid():
              tip = _('Array dimensions not valid')
              widget.setIcon(ima.icon('MessageBoxWarning'))
              widget.setToolTip(tip)
              QToolTip.showText(self._widget.mapToGlobal(QPoint(0, 5)), tip)
          else:
              self._button_warning.setToolTip('')
docs: Updates the icon and tip based on the validity of the array content.