code: def on_palette_name_changed(self, combo):
          
          palette_name = combo.get_active_text()
          if palette_name not in PALETTES:
              return
          self.settings.styleFont.set_string('palette', PALETTES[palette_name])
          self.settings.styleFont.set_string('palette-name', palette_name)
          self.set_palette_colors(PALETTES[palette_name])
          self.update_demo_palette(PALETTES[palette_name])
docs: Changes the value of palette in dconf