Current behaviour on oldid pages is the same as for current ones - that is, the "Save page" button is greyed out and won't activate until the content changes.

However, for oldid pages the content is already "changed" compared to the current revision, so it should be active right from the start. Also, ideally it should say "Restore page" at first, changing to "Save page" when/if the page's contents have been altered.

Version: unspecified
Severity: minor