docs: def _create_decoration(self, selection_start, selection_end):
          """ Creates the text occurences decoration """
          deco = TextDecoration(self.editor.document(), selection_start,
                                selection_end)
          deco.set_background(QtGui.QBrush(self.background))
          deco.set_outline(self._outline)
          deco.set_foreground(QtCore.Qt.black)
          deco.draw_order = 1
          return deco