Thanks for answer, . I know about this option, but it does not help to totally unmerge nano because it glued to minimal profile. Is there any reason to use app-editor/nano instead virtual/editor in minimal profile?
Now i solved my problem with replacing one line in /usr/portage/profile/funtoo/1.0/linux-gnu/flavor/minimal: app-editor/nano -> virtual/editor and on @system update portage does not try to emerge nano. But i dont like this solution due to git pull conflicts in the future.