Undoing or redoing changes in the global-variables-editor

How to undo the most recent edit action in the global-variables-editor :

1. In menu Edit, select Undo. Alternative: Press Ctrl+Z.

2. Repeat the last step as often as you need to reverse editing actions.

How to redo the most recent undone edit action in the global-variables-editor :

1. In menu Edit, select Redo. Alternative: Press Ctrl+Y.

2. Repeat the last step as often as you need to re-apply editing actions that have been reversed by Undo