Merge branch '20454-edit-button-mr' into 'master'

edit_blob_link can receive the blob to avoid access to the repository

## What does this MR do?

Avoid access to the repository to get the blob when can be passed on context

## Are there points in the code the reviewer needs to double check?

## Why was this MR needed?

#20454 to try to speed up the diff pages

## What are the relevant issue numbers?

Relates #20454 probably we want and UI solution not just a backend solution

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- ~~[ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)~~
- ~~[ ] API support added~~
- Tests
  - [x] Added for this feature/bug
  - [ ] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)


See merge request !5850

2 files changed, 6 insertions, 10 deletions

diff --git a/app/helpers/blob_helper.rb b/app/helpers/blob_helper.rb
index 48c27828219..8932b94c599 100644
--- a/app/helpers/blob_helper.rb
+++ b/app/helpers/blob_helper.rb
@@ -11,17 +11,14 @@ module BlobHelper
   def edit_blob_link(project = @project, ref = @ref, path = @path, options = {})
     return unless current_user
 
-    blob = project.repository.blob_at(ref, path) rescue nil
+    blob = options.delete(:blob)
+    blob ||= project.repository.blob_at(ref, path) rescue nil
 
     return unless blob
 
-    from_mr = options[:from_merge_request_id]
-    link_opts = {}
-    link_opts[:from_merge_request_id] = from_mr if from_mr
-
     edit_path = namespace_project_edit_blob_path(project.namespace, project,
                                      tree_join(ref, path),
-                                     link_opts)
+                                     options[:link_opts])
 
     if !on_top_of_branch?(project, ref)
       button_tag "Edit", class: "btn disabled has-tooltip btn-file-option", title: "You can only edit files when you are on a branch", data: { container: 'body' }
diff --git a/app/views/projects/diffs/_file.html.haml b/app/views/projects/diffs/_file.html.haml
index 8fbd89100ca..ad2eb3e504f 100644
--- a/app/views/projects/diffs/_file.html.haml
+++ b/app/views/projects/diffs/_file.html.haml
@@ -10,10 +10,9 @@
           \
 
           - if editable_diff?(diff_file)
-            = edit_blob_link(@merge_request.source_project,
-                @merge_request.source_branch, diff_file.new_path,
-                from_merge_request_id: @merge_request.id,
-                skip_visible_check: true)
+            - link_opts = @merge_request.id ? { from_merge_request_id: @merge_request.id } : {}
+            = edit_blob_link(@merge_request.source_project, @merge_request.source_branch, diff_file.new_path,
+                             blob: blob, link_opts: link_opts)
 
         = view_file_btn(diff_commit.id, diff_file.new_path, project)