When it's detected that a file was changed externally while saving, the prompt asks if it should "Neu laden" ("reload") the file. That should as far as I understand overwrite the changes that had been made within XML Copy Editor with the current document on the HD.
What would make more sense and is IMHO what XML Copy Editor actually does is asking to overwrite the changes that have been made externally with the content within XML Copy Editor. If I'm right, the german translation on the button should be "Überschreiben" (overwrite) instead of "Neu laden" (reload).
.
Thank you. Fixed in [740e8a].
Related
Commit: [740e8a]