Help:Merge history

Merge history (added in version>Release notes/1.12|MW 1.12) is a that makes it possible to automatically merge the history of two pages.

This feature is accessible for users with the   at Special:MergeHistory. Users in the user group have this right assigned to them by default.

Pages merged through this special page are logged in a "merge>Special:Log/merge|merge log".

Benefits

 * It does not create a new revision of the source page.
 * It does not lead to licensing violation, which would have resulted from cutting and pasting.
 * The history of a page is not split among different pages.

Special cases
If the destination page started as a redirect to the source page, it will cause an overlap in revisions hence preventing a full MergeHistory. To fix this:
 * Delete the destination page.
 * Restore all but previously deleted and the redirect revisions.
 * It is now possible for a MergeHistory to occur.

Undoing a merge
Go to Special:Log/merge then click "Unmerge".