The Redo function will revert the last change that the Undo function removed. If multiple changes were removed via the Undo function, reverting them via the Redo function will add the changes back in order that the changes occurred.
For example: If you add a page tab on count 0, then choose to Undo the change, the page tab on count 0 would be removed. Selecting Redo will add the page tab back to count 0, as that was the last action that was undone.
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