It has been observed that filenames which contain newline characters have the
newlines (0x0a) replaced with a space character (0x20) when checked out with a
1.7 client (ra_neon).
Other RA layers retain the 0x0a character in the filename.
See
http://mail-archives.apache.org/mod_mbox/subversion-dev/201303.mbox/%3C20130326133615.GI24792%40ted.stsp.name%3E
While a filename containing 0x0a causes many others issues (see issue #4340) we
should investigate where and why this transformation occurs. Interesting
questions include whether this problem is specific to ra_neon, and whether it
only affects newlines or also other kinds of whitespace.