When using "copy packages" and "Rebuild the copied sources" the old diff is taken to the destination PPA. But at least when using "Rebuild the copied sources" the diff should be rebuild against the superseded package from the destination PPA or in case there is against the matching Ubuntu package.
It makes no sense to have a diff against a package that isn't in the same PPA.
When using "copy packages" and "Rebuild the copied sources" the old diff is taken to the destination PPA. But at least when using "Rebuild the copied sources" the diff should be rebuild against the superseded package from the destination PPA or in case there is against the matching Ubuntu package.
It makes no sense to have a diff against a package that isn't in the same PPA.