git blame shows wrong "Not commited yet" entries

 
Hi,

I am using MsysGit 1.7.11 on WinXP 32 bit and experience the folllowing strange behaviour:
 
For a file like "File.txt" in the repo, "git blame file.txt" (note the lower case)
shows "Not commited yet" for every single line in the file. 
"git blame File.txt" (correct upper case spelling) gives the correct output.
"core.ignorecase" is "true" so this behaviour is not what I expected.

Is this a bug in MsysGit or some kind of intended behaviour (or bug) in Git?


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Thomas