Tgr added a comment.

When you are undoing past edits (ie. the "new" end of the undo range is not the current edit), the undo operation creates a content (array of contents, post-MCR) that does not exist on disk. That content needs to be presented to the user and then saved. Currently, EditPage just displays that content in the edit form; adding support for undo-without-edit would be nontrivial work, while multi-slot editing gives you multi-slot undo for free. (OTOH maybe we need undo-without-edit anyway if some slots don't support editing but support undo?)



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