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Session::grouped(label, f) runs f as one undo step on the active document. On success the group leaves exactly one undo entry holding the workbook from before the group; on error it restores the workbook, selection, undo and redo stacks as they were and returns the error. group_begin, group_end and group_rollback do the same across separate calls, for an action that runs one step per call. While a group is open on a document, undoable commands on it add no undo steps of their own, so a long group neither grows the history nor pushes older entries past the undo limit, and Undo and Redo are disabled there. Groups nest: the outermost one makes the step, and a failing inner group rolls back only its own changes. Closing a document drops its groups, and a command that panics drops the groups it opened. history.list reports whether a group is open. Insert Copied Cells folds its nested steps into one undo step by counting revisions; inside a group the nested steps push no entries, so it now leaves the history alone there instead of removing entries from before the group.