Log: follow file copy

While refactoring some code, I often have to split up large files into smaller ones. This results in loosing the history of all code which is relocated from the original file.

As a countermeasure I found this workaround for git:

- first duplicate the original file (copy it using a new filename and/or location)

- commit this duplication without any changes (this is a commit which might not build properly)

- remove the duplicate code from both files

- commit changes (this commit should work fine)

On the commandline, using "git log --follow" it is now possible to track all changes of the new file across the duplication step. With smartgit this does not work; smartgit seems to follow renamed files only.

I would like to propose a (maybe optional) follow-copy-strategy in the log view - from my point of view only exact copies need to be detected, which should keep the cost at minimum.