windows: wrap `os.getcwd()` in `os.path.realpath()` on py3...
windows: wrap `os.getcwd()` in `os.path.realpath()` on py3
I noticed various `test-check-*` failures that were printing absolute paths
when repo relative paths were expected. This was due to the drive letter in
`repo.root` being uppercased as it is run through `os.path.realpath()`, and then
the simple string comparison against the (lowercased) `_cwd` member of dirstate
in `dirstate.getcwd()` causing an absolute path to be returned, instead of the
expected `b''`. That in turn causes `scmutil.getuipathfn()` to wrongly use
`repo.pathto()` with an absolute cwd path.
.
Differential Revision:
https://phab.mercurial-scm.org/D9806
