Re: git-diff/git-diff-files: Turn off copy-detection?

> I'm trying to diff the header files between two version of a repo, to do
> an ABI review, but get too many diffs from 'similar copy', which makes
> the review hard. These are generally unrelated files, but due to large
> copyright header, and spaces, the actual changes are not large enough to
> be detected as new files. I'd therefore like to turn off copy detection
> completely, or at least set some kind of threshold before a file is
> considered a copy in the diff.
> 
> Doing a 'git diff origin/4.5..origin/4.6 -- src/corelib' gives me this
> excerpt:
> 
> diff --git origin/4.5/src/corelib/tools/qtimeline.h
> origin/4.6/src/corelib/animation/qabstractanimation.h
> similarity index 58%
> ...