TortoiseGit gets the wrong revision if the branch name looks like git-describe format

By @ch3cooli on February 02, 2013 06:42 (imported from Google Code)

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What steps will reproduce the problem?

1. At revision 1234567, Create a branch that is named like git-describe format, such as abc-12-g3456789, but not abc-12-g1234567. Need not have abc branch or tag.
2. Show log

What is the expected output? What do you see instead?
Expected: The branch points to revision 1234567
Actual: The branch points to revision 3456789

What version of TortoiseGit and msysgit are you using? On
what operating system?
TortoiseGit 1.8.0
msysgit 1.8.0