[Bug 4463] New: extdiff: extra quotation breaks WinMerge's command-line parsing

[mercurial-bugs at selenic.com]

http://bz.selenic.com/show_bug.cgi?id=4463

          Priority: urgent
            Bug ID: 4463
                CC: mercurial-devel at selenic.com
          Assignee: bugzilla at selenic.com
           Summary: extdiff: extra quotation breaks WinMerge's
                    command-line parsing
          Severity: bug
    Classification: Unclassified
                OS: Windows
          Reporter: yuya at tcha.org
          Hardware: PC
            Status: UNCONFIRMED
           Version: 3.2.1
         Component: extdiff
           Product: Mercurial

Vanessa Schäfer found that "/r" has different meaning from /r in WinMerge.
So I think 72a89cf86fcd breaks backward compatibility on Windows.

# HG changeset patch
# User Michael Fyles <mf at vorston.net>
# Date 1343299093 -3600
#      Thu Jul 26 11:38:13 2012 +0100
# Branch stable
# Node ID 72a89cf86fcd78dfa500031b5734147e6b830fbc
# Parent  7867f15b4a387a85c24cf614df478183da7525ea
extdiff: quote user-supplied options passed to shell

Original bug report:
https://bitbucket.org/tortoisehg/thg/issue/3978/

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