Redmine

This can be turned into a Better handling of renamed item revision history FR but RM actually triggers a 404 where it should not:

Looking at a renamed file revision history, e.g. /app/views/issues/show.html.erb which has been renamed with r7043:

• if you try to get r7043 diff, you'll get an empty page (weird, but not an error)
• if you try to get a diff between a revision > r7043 and any other revision you'll get a correct diff
• if you try to get a diff between 2 revisions < r7043 you'll get a 404

FR idea: insert some "File has been renamed from <XX>" after r7043 line.

The 404 is the bug.