Hey!
tl;dr after the next deploy merging two
items creates a redirect, merge gadget (and every tool with a similar
functionality) needs to be adjusted to the new functionality
There was a change to the
functionality of merging items. Whenever you merge two items a redirect will be
automatically created.
If you merge via the
special page nothing changed - except for the item, that is merged into
another item now also redirects to that item.
The same
goes for the API except for using 'ignoreconflicts'- when the item is
not left empty after the merge it won't be a redirect and still be
there as before without the data that got merged into the other item.
(So it will only have the data that would have given a merge conflict.)
Last but not least: The merge gadget will need some adjusting. That's expected since the functionality changed.
Please keep that in mind if you have any tool, that merges items.