bug#65854: Multi-file replacement diff

[Juri Linkov]

>> Actually my point was that there is already eglot--propose-changes-as-diff.
>> And now with addition of multi-file-replace-as-diff you will have two cases
>> to generalize that would be simpler to do than with only one case.
>
> Yes, that should help. Even having your patch in the bug tracker to refer
> to already helps (as well as the discussion around it).

And adding a third implementation could help more ;-)
What is still missing is doing replacements as diffs
from xref buffers - I discovered this is much needed
as poor-man's renamings in projects without eglot support.