docs: def highlightByAlternate(self):
          """
          Sets the palette highlighting for this tree widget to use a darker
          version of the alternate color vs. the standard highlighting.
          """
          palette = QtGui.QApplication.palette()
          palette.setColor(palette.HighlightedText, palette.color(palette.Text))
          
          clr = palette.color(palette.AlternateBase)
          palette.setColor(palette.Highlight, clr.darker(110))
          self.setPalette(palette)