def zoom_in(self, increment=1):
        """
        Zooms in the editor (makes the font bigger).

        :param increment: zoom level increment. Default is 1.
        """
        self.zoom_level += increment
        TextHelper(self).mark_whole_doc_dirty()
        self._reset_stylesheet()
Zooms in the editor (makes the font bigger).

        :param increment: zoom level increment. Default is 1.