run-this-one changed command handling (requires a single command now) / shell arg issue

I have been using "run-this-one" to call a program with multiple arguments, and this stopped working after upgrading to Saucy.

It appears to be related to this change:
http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/saucy/run-one/saucy/revision/1.1.7

Using $@ is different from using $CMD (after CMD="$@").
The first one handles positional arguments, but the second one is just a string (see e.g. http://osr600doc.sco.com/en/SHL_automate/_Passing_to_shell_script.html).

I think the flock line(s) should be reverted to

    flock -xn "$FLAG" "$@"

again. (Note that there's no "-c" here, which requires a single argument).

TEST CASE:
% run-this-one ssh localhost "printf '%s\n' 'on line one' two 3"
onnlinenonentwon3n%

Quoting the command with run-this-one works around this:
% run-this-one "ssh localhost \"printf '%s\n' 'on line one' two 3\""
on line one
two
3

WORKS (flock directly, without -c):
% flock -xn /tmp/flag ssh localhost "printf '%s\n' 'on line one' two 3"
on line one
two
3

WORKS (flock directly, with -c):
% flock -xn /tmp/flag -c "ssh localhost \"printf '%s\n' 'on line one' two 3\""
on line one
two
3

If the current behavior should be kept (which I would not recommend), run-this-one should test if it is being passed a single argument only then.

Funnily it appears that this was meant to fix another bug reported by me (bug 1189950).

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: run-one 1.13-0ubuntu1 [modified: usr/bin/run-one]
ProcVersionSignature: Ubuntu 3.11.0-12.18-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
ApportVersion: 2.12.5-0ubuntu1
Architecture: amd64
Date: Fri Oct 11 00:29:57 2013
InstallationDate: Installed on 2012-05-28 (500 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: run-one
UpgradeStatus: Upgraded to saucy on 2013-10-08 (2 days ago)