When an article/category is cloned (also across workspaces), the respective revision history is lost! In some circumstances, this information would be interesting. There may be different approaches, for example, (a) option to clone with the complete history, (b) option to clone with at least the history comments, (c) include at least the info that it is a cloned article/category with a link to the original one (right now you cannot differentiate whether an article was cloned or created from scratch).