Join GitHub today
Migrate to changesets notice also shows when somebody has directly installed WordPress > 4.7 #123
"Existing Snapshots need to be migrated to Changesets, which was added to core in WordPress 4.7." notice should not show if somebody has directly installed WordPress > 4.7, or there are no changesets to migrate.
May be we can do this here https://github.com/xwp/wp-customize-snapshots/blob/develop/php/class-migrate.php#L51-L57