Undo not working properly with Numbered/Bullet list Styles

[Satya Minnekanti]

To reproduce the defect:

1. Open Ajax sample.

2. Type 2 lines of text and select them and Click on Insert/Remove Numbered List icon to make them a Numbered list

3. Right click next to one of the Numbered list item and select Numbered List Properties in the Context menu.

4. Select Numbered List Type as Upper Roman in the Numbered List properties dialog and Click OK button.

5. See that the Numbered list type changes to Upper Roman

6. Right click next to one of the Numbered list item and select Numbered List Properties in the Context menu.

7. Select Numbered List Type as Upper Alpha in the Numbered List properties dialog and Click OK button.

8. See that the Numbered list type changes to Upper Alpha

9. Now press Undo Once

Expected Result:

Numbered list Type should change back to Upper Roman.

Actual Result:

Numbered List Type is changing back to default Type(Decimal).

Same behaviour happens with Bullets

[Garry Yao]

Dialog command is the one to open dialog but not making changes, actually this's supposed to be fixed by #5415.

[Tobiasz Cudnik]

It has been fixed with #5415.