Merge branch 'git-follow' into 'master'

Use git follow flag for commits page when retrieve history for file or directory

This can be really helpful when you want commit history for file that was moved recently

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !1680

CHANGELOG

@@ -10,6 +10,7 @@ v 8.2.0 (unreleased)
   - Allow users to select the Files view as default project view (Cristian Bica)
   - Show "Empty Repository Page" for repository without branches (Artem V. Navrotskiy)
   - Fix: Inability to reply to code comments in the MR view, if the MR comes from a fork
+  - Use git follow flag for commits page when retrieve history for file or directory
 v 8.1.0
   - Ensure MySQL CI limits DB migrations occur after the fields have been created (Stan Hu)

app/models/repository.rb

@@ -67,13 +67,16 @@ class Repository
   end
   def commits(ref, path = nil, limit = nil, offset = nil, skip_merges = false)
-    commits = Gitlab::Git::Commit.where(
+    options = {
       repo: raw_repository,
       ref: ref,
       path: path,
       limit: limit,
       offset: offset,
-    )
+      follow: path.present?
+    }
+
+    commits = Gitlab::Git::Commit.where(options)
     commits = Commit.decorate(commits, @project) if commits.present?
     commits
   end