def get_box_colliding(self):
        """Return set of objs colliding w/ selection box."""
        ### reference collision operation locally
        collides = self.selection_box.colliderect

        ### return set with each colliding object

        return {
            ## store an object...
            obj
            ## for each obj among the function nodes and
            ## text blocks...
            for obj in chain(APP_REFS.gm.nodes, APP_REFS.gm.text_blocks)
            ## if that object collides with the selection box
            if collides(obj.rect)
        }
Return set of objs colliding w/ selection box.
nodezator/editing/selection.py