Comment 4 for bug 737387

I agree some of the points you mentioned but that leads to problems. Situation actually depends on what user plans to do. No change of UUID is needed if the new partition will not be used in the same computer with the old one and no further editing of destination partition will now be done. The other effect of that situation is that Gparted will show destination mounted, does not allow to dismount "sdb" and as a result no further action for "sdb" is possible (unless you understand to change manually UUID for the destination disk). I regard that a confusing situation for users, too. Problem with further editing with Dparted could be avoided by generating new UUID for the new copy just to keep Unique = Unique i.e. what that UUID stands for. Some users could be surpised but I can not see any technical problem resulting from that approach.

I prefer giving users a choice (tickbox, menu, what ever) to select "Keep oroginal UUID" with some short warning about results but just to avoid problems the default should be "Unique = Unique" i.e. old UUID kept intact if it exists on destination or a new one generated otherwise.