test-merge-tools: stabilize for Windows This masks the Windows argument parsing insanity[1], so it needs a bit of explanation. (The security reference in the footnote is probably useful to keep in mind if we ever whitelist certain in-repo config settings.) 9037c29e9f53 introduced tests that were failing on Windows with an unbalanced double quote[2]. What ends up happening here is util.shellquote() is double quoting the file path, but the shell script is placing this ->": "<- right next to it. So cmd.exe gets launched with 'lb:base": ""c:\...\f~base.xyz"', which got interpreted as 'lb:base: "c:\...\f~base.xyz'. If the test is adjusted to quote like "lb:$labelbase: $base", then MSYS runs interference and strips the '\' characters. I was able to get the expected result by dropping the quotes from '": "', and changing the space to underscore. But since we need to glob away the C: part anyway, just glob away the quote and leave the test unchanged. [1] https://blogs.msdn.microsoft.com/twistylittlepassagesallalike/2011/04/23/everyone-quotes-command-line-arguments-the-wrong-way/ [2] https://buildbot.mercurial-scm.org/builders/Win7%20x86_64%20hg%20tests/builds/441/steps/run-tests.py%20%28python%202.7.13%29/logs/stdio