Method _push_undo

SLiCAP/schematic/canvas.py:984–986

Snapshot current state as a new undo point.

(self)

    # ── undo / redo ───────────────────────────────────────────────────────────

    def _push_undo(self) -> None:
        """Snapshot current state as a new undo point."""
        self._push_snapshot(self.to_data())

    def _push_snapshot(self, data) -> None:
        """Push a pre-captured snapshot onto the undo stack."""