Online Editor loses UTF-8 encoding

Files in UTF-8 (without BOM) encoding get correctly interpreted by the Online Editor for viewing, but when saving changes, the encoding is lost.

Steps to reproduce:

• Commit file in utf-8 without bom and special characters (äöüè...)
• Open file in online editor from bitbucket and add text and commit.
• After saving, the file is no longer in utf-8. Even when not changing the lines with special characters, the special characters are in a different encoding after the online-commit.

Experienced in chrome, if that changes anything.