Answer file parsing interprets `\"` as end of quoted string

[nohwnd]

    [TestMethod]
    public void TestCommandLineSplitter()
    {

        VerifyCommandLineSplitter("", []);
        VerifyCommandLineSplitter("/testadapterpath:\"c:\\Path\"", [@"/testadapterpath:c:\Path"]);
        VerifyCommandLineSplitter("/testadapterpath:\"c:\\Path\" /logger:\"trx\"", [@"/testadapterpath:c:\Path", "/logger:trx"]);
        VerifyCommandLineSplitter("/testadapterpath:\"c:\\Path\" /logger:\"trx\" /diag:\"log.txt\"", [@"/testadapterpath:c:\Path", "/logger:trx", "/diag:log.txt"]);

// New test case that fails!
        VerifyCommandLineSplitter("/Tests:\"Test(\\\"iCT 256\\\")\"", ["/Tests:\"Test(\\\"iCT 256\\\")\""]);
    }

last touched in #1196 8 years ago when fixing some mysterious other edge cases.

Only affects answer files. Where it fails to interpret \" as the end of the quoted string (it always considers " as isQuoted != isQuoted, and so if any space follows the space will jump out of the inner loop acting as end of token.

Used by TIA and test retry in AzureDevOps.

[nohwnd]

@copilot look at #1196 for past changes to the code and try to come up with the issues that the PR was trying to fix.

[nohwnd]

fixed in #15306