The trouble with patches is that you can't get engineers to reliably declare whenever they copy or move code and where it came from. This is part of why svn mer

The trouble with patches is that you can't get engineers to reliably declare whenever they copy or move code and where it came from. This is part of why svn merging was such a trainwreck, undeclared copies and moves (which look like delete+insert) almost always conflicted.