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Steps to reproduce issue
1) Copy and paste grid from attachment to spreadsheet from enclosed excel file

2) Select all items and apply bold
3) Then apply italic
4) Then apply strikethrough
5) Then apply any color to text
6) Then click undo until you revert grid state to condition from point 1 (undo button should be disabled as there are no changes to undo)
Actual result:

Expected result: all changes should be reverted.