color: sync text attributes and buffered text output on Windows (issue5508) I originally noticed that log output wasn't being colored after 3a4c0905f357, but there were other complications too. With a bunch of untracked files, only the first 1K of characters were colored pink, and the rest were normal white. A single modified file at the top would also be colored pink. Line buffering and full buffering are treated as the same thing in Windows [1], meaning the stream is either buffered or not. I can't find any explicit documentation to say stdout is unbuffered by default when attached to a console (but some internet postings indicated that is the case[2]). Therefore, it seems that explicit flushes are better than just not reopening stdout. NB: pager is now on by default, and needs to be disabled to see any color on Windows. [1] https://msdn.microsoft.com/en-us/library/86cebhfs(v=vs.140).aspx [2] https://sourceforge.net/p/mingw/mailman/message/27121137/

test-check-help: fix to work on Windows The initial problem was `hg files` prints paths with '\', which gets removed when piped (scanhelptopics.py failed to open 'hgext__init__.py'). Then, xargs was invoking `hg help` with 'backout\r (esc)', which setting binary mode prevents.

branchmap: be more careful about using %d on ints Not doing so breaks Python 3.

util: use bytes re on bytes input in fspath Fixes `hg add` on Python 3.

util: use pycompat.bytestr in checkwinfilename Fixes `hg add` on python3.

dispatch: ensure repr is bytes in _mayberepr Fixes command line arguments containing spaces on Python 3.

dispatch: extract maybe-use-repr formatting to helper function I think this makes the code much clearer. I had to think for a bit to unpack the old-school `condition and if-true or if-false` dance, and formatting argument lists here shouldn't be performance critical.