diff --git headers pack two paths on one space-delimited line, which broke
for unquoted paths containing spaces and for git's C-style octal-quoted
paths (non-ASCII filenames). Add quote-aware header splitting plus a git
unquote helper, and prefer the unambiguous "--- a/"/"+++ b/" lines to
correct the file's identity when present.
mika kuns
0f2d202b01