Last I checked. (about a year ago I guess)
In relation to File: pages "Merge history" will:
- do the "Page history" revisions.
- but not the "File history" revisions.
(ie: unless changed ... one needs to use page-move to do both at the same time for File: pages with files/images)
(Thought about adding this to the main page ... but I see codes I don't know. Ergo: using Talk-page.)