[Grid Editor] A single CTRL + Z operation reverses the last two actions

[ZDabrowski]

When we press CTRL + Z, the last two actions on a Grid Editor will be undone at once.

Environment
Python 3.10.12
wxPython 4.2.1
robotframework 6.0.2
robotframework-ride 2.1.dev61
Ubuntu 22.04.4 LTS

Steps
0. Code example

1. Insert three cels. 3x CTRL + SHIFT + I (OK)
   
2. Undo action by pressing 1x CTRL + Z hotkey
   
3. Add two rows, 2x CTRL + I
   
4. Undo action by pressing 1x CTRL + Z hotkey
   
5. Add a Comment (row 5)
   
6. Undo action by pressing 1xCTRL + Z hotkey (two last actions: (5.) and (1.) reversed)
   
7. Delete two rows, 2x CTRL + D
   
8. Undo action by pressing 1xCTRL + Z hotkey
   

Additional info
In the other hand, when pressing CTRL+Y (redo hotkey) multiple times, each subsequent action will be restored one at a time - as expected.

*** Test Cases ***
Test Rows
    Log    1st line
    Log    2nd line
    Log    3rd line
    Log    4th line

[HelioGuilherme66]

@ZDabrowski Thanks for the report.

In Linux there has been this situations of "double actions", which I had to condition in several actions. Seems that I also need to do for Ctrl-Z.