Should the relation osm.org/relation/5824965 also be deleted? It has no members anymore.

Before: http://www.directupload.net/file/d/4567/x6os4xp6_jpg.htm. After: http://www.directupload.net/file/d/4567/ky6nlvun_jpg.htm.

deleted way 458176600, see osm.org/changeset/44250341

Ok. My goal was just to create a valid geometry by doing as few changes as possible.

That might very well be correct. Way 458176600 was created by splitting way 227215867 (v4) and way 458176599 was created by splitting way 283845170 (v7). Before splitting the ways they looked like this: http://www.directupload.net/file/d/4562/8qyl7isn_jpg.htm . The relation that I edited contained both of the original ways.