Should the relation 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 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.