It's interesting that I can still enter those using the multibyte editbox by using shortcuts on a US layout...
Ctrl-' then e shows é
Ctrl-` then e shows è
Ctrl-^ (ctrl-shift-6) then o shows ô
Ctrl-: (ctrl-shift-;) then o shows ö
Ctrl-~ (ctrl-shift-`) then n shows ñ
...and so on.
I wonder why that's not affected. I'm not surprised that Alt codes work fine as those don't need multibyte display to function, but the shortcuts I mentioned *do* need multibyte display to work, so I'd expect them to be similar to the other languages, but I guess not.
