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>     I was in such a situation yesterday. Normally I use latin-1 encoding but
>     switched to language environment latin-9 to edit some files containing Euro
>     signs and forgot about this change. Then I loaded a 400 line DOS file
>     containing "-*- coding: cp850 -*-" in the first line. Emacs encoded all the
>     umlauts already in the file as latin-1 but encoded the typed umlauts as
>     latin-9. And after minor changes all over the file and a few interruptions
>     I didn't remember which parts were changed and which were old ...
> 
> Does anyone have an idea for what we should do about this?
> Does the change to turn on unify-on-encoding fix this automatically?

It does fix the above case, yes.

> Will the switch to native Unicode fix it?

It will also fix it.


	Stefan