Set the recent opened files on editor based on active project.

        If no project is active, then editor filenames are saved, otherwise
        the opened filenames are stored in the project config info.

def set_open_filenames(self):
        """
        Set the recent opened files on editor based on active project.

        If no project is active, then editor filenames are saved, otherwise
        the opened filenames are stored in the project config info.
        """
        if self.projects is not None:
            if not self.projects.get_active_project():
                filenames = self.get_open_filenames()
                self.set_option('filenames', filenames)