0.12.2dev: Avoid a race condition when running the test suite on Windows 7 while having a Windows Explorer window of the source folder open.
0.12.2dev: Avoid a race condition when running the test suite on Windows 7 while having a Windows Explorer window of the source folder open.

Part of #9682.


git-svn-id: 764b04d0c6fbbea0ee05220aef3208173ff13049@10225 af82e41b-90c4-0310-8c96-b1721e28e2e2

rbaumg/trac,rbaumg/trac,rbaumg/trac,rbaumg/trac