Toolbar cell commands do not get current cell but get the selected cell as an argument

[DonJayamanne]

• VS Code Version: Insiders
• OS Version: Mac

Steps to Reproduce:

1. Create a notebook extension
2. Add a cell toolbar and wire up a command
3. Create a notebook with 2 cells
4. Select the second cell
5. CLick the toolbar button on the first cell
6. The command gets the second cell (because second cell is selected).

@rebornix I think you fixed this for split or some others, however i believe it was only fixed for VS Code Core commands. Looks like the commands are not getting the right cell in extensions as well.

Does this issue occur when all extensions are disabled?: Yes/No

[DonJayamanne]

Apologies bug at my end.