Edge redo fails after undoing both connected nodes

[rockymine]

Description:
When both nodes of an edge are removed via undo, the edge cannot be restored with redo. The history/redo stack appears to be corrupted in this specific case.

Steps to reproduce:

1. Create two nodes and connect them with an edge
2. Undo the first node (edge disappears)
3. Undo the second node
4. Try to redo → Edge does not reappear

Expected: Edge should be restored when both nodes are back
Actual: Edge remains missing