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help.gnome.org/users/gnome-help/stable/… is probably what you a looking for. Let me know if it helps and I'll type it up as an answer proper so you can accept it.– Lefty G BaloghCommented Jan 25, 2017 at 19:13
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Thanks, I already been through this, nothing mentioned about undo-shortcut or something like it.– Beach ChickenCommented Jan 25, 2017 at 19:18
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So it is not the shortcut but the "undo" functionality you are after, right? What exactly are you trying to undo?– Lefty G BaloghCommented Jan 26, 2017 at 17:01
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Yes it is the undo function. Usage example: when making typos.– Beach ChickenCommented Jan 26, 2017 at 17:22
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