Description:
When a new master slide is added, the action is not recorded in the undo history. As a result, the user cannot use the undo function (Ctrl+Z) to revert the addition. The only way to remove the newly added master slide is to manually delete it.

Steps to Reproduce:
1.Open a presentation.
2.Switch to the "Master Slide" view.
3.Add a new master slide.
4.Press Ctrl+Z or go to Edit → Undo.


Actual Results:
Nothing happens — the undo action does not affect the addition of the master slide.

Expected Results:
The newly added master slide should be removed when undo is triggered.


Reproducible: Always


User Profile Reset: No

Additional Info:
This issue affects usability and consistency, as most actions in the application can be undone.