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A command that changed the workbook cleared the redo history even when an open group owned its step. When the group was then rolled back inside the same command (the debugger's Stop with Undo Changes), the rollback put the redo history back and the command's bookkeeping cleared it again. Now only a command that makes a step of its own clears the redo history; a group clears it when it ends as a step, and a rollback restores it.