1. I found that my helper's rollout with some spinners can keep to undo/redo system although I do not add any codes for this purpose.
But my popup floating window with some spinners can not keep undo/redo.
Maybe you can teach me what I should to learn and to read.
2. My tool will move one object along a path that I generated. But I found the movement is recorded to undo/redo unwanted. In fact, I only expect the beginning position and the last position be added to undo/redo. What should I do?