Running git diff locally shows that a file has been renamed, but the patch actually uploaded by `webkit-patch upload` uses git diff with --no-renames to generate the patch (See create_patch() in webkitpy/common/checkout/scm/git.py). As a result, the uploaded patch shows a deleted file and a new file, thereby losing history. That --no-renames flag was added in 2011 as part of https://bugs.webkit.org/show_bug.cgi?id=48075. Filing this bug now since I'm not sure if those issues still exist, or if they have since become feasible to fix.