git log -Sfoo ignores indentation (whitespace?) changes...

Commits where only the indentation of 'foo' is changed are not shown with "git log -Sfoo". Is there any way to force showing them along with other changes involving foo? (E.g. for python, indentation matters!)

Why doesn't the second commit show up in the following?

$ git init

# Create text containing 'line' without whitespace $ echo 'line' > text $ git add text $ git commit -m "first" text

# Here, I add one space of indentation in front of 'line' $ echo ' line' > text $ git commit -m "second" text

# git log -Sline shows only the first commit, not the second,
# where the indentation changed.
$ git log -Sline
commit c4481e4b38bb521d91583e5c5a3b2b98f08b7ec0
Author: pvm <pvm@change_me.dk>
Date:   Tue Mar 3 14:45:38 2009 +0100

     first

# But clearly, the second commit *also* has changes
# containing 'line':
$ git log -p HEAD~..HEAD
commit 6cb883409aa9ccda00d7720ee9bf4fa59918c5fd
Author: pvm <pvm@change_me.dk>
Date:   Tue Mar 3 14:45:39 2009 +0100

     second