A classic problem in large repositories is when someone reformats the code, touching most lines in every file. This makes git blame a lot less useful, as all roads lead to Rome (the revision where the reformatting was done).
git blame, however, can ignore a list of revisions:
> git blame --ignore-revs-file .git-blame-ignore-revs
Adding this to SmartGit's Blame and Investigate views would be very handy.
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