Here we go with the Code again:
http://pastebin.com/Kqh8dNQs
Okay, looks like nobody can help in here.
But i solved the problem on my own 🙂
If some one else got the same problem:
Here is a solution placed in image-edit.php on Line 162. Just before the part with the selection:
[Code moderated as per the Forum Rules. Please use the pastebin]
If someone has an idea how to solve this problem without ‘hacking’ the core. It would be nice to read it here!