pathutil: use util.pathto() to calculate relative cwd in canonpath()
os.path.relpath() exploded if the 'root' and 'cwd' directories had different
drive letters. I noticed this in TortoiseHg when typing a fileset into the
filter, and it kept complaining until the closing '()' was typed. This was
reproducible on the command line with:
$ cd /d
$ hg -R /c/Users/Matt/Projects/hg files 'set:e'
Traceback (most recent call last):
...
File "mercurial\pathutil.pyc", line 182, in canonpath
File "ntpath.pyc", line 529, in relpath
ValueError: path is on drive c:, start on drive d:
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true