Merge branch '27291-unify-mr-diff-file-buttons' into 'master'

unifies mr diff file button style

Closes #27291

See merge request !8874

app/assets/stylesheets/framework/buttons.scss

@@ -330,10 +330,6 @@
   }
 }
 
-.btn-file-option {
-  background: linear-gradient(180deg, $white-light 25%, $gray-light 100%);
-}
-
 .btn-build {
   margin-left: 10px;
 

app/helpers/blob_helper.rb

@@ -21,7 +21,7 @@ module BlobHelper
                                      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' }
+      button_tag "Edit", class: "btn disabled has-tooltip", title: "You can only edit files when you are on a branch", data: { container: 'body' }
     elsif can_edit_blob?(blob, project, ref)
       link_to "Edit", edit_path, class: 'btn btn-sm'
     elsif can?(current_user, :fork_project, project)
@@ -32,7 +32,7 @@ module BlobHelper
       }
       fork_path = namespace_project_forks_path(project.namespace, project, namespace_key: current_user.namespace.id, continue: continue_params)
 
-      link_to "Edit", fork_path, class: 'btn btn-file-option', method: :post
+      link_to "Edit", fork_path, class: 'btn', method: :post
     end
   end
 

app/helpers/commits_helper.rb

@@ -198,7 +198,7 @@ module CommitsHelper
     link_to(
       namespace_project_blob_path(project.namespace, project,
                                   tree_join(commit_sha, diff_new_path)),
-      class: 'btn view-file js-view-file btn-file-option'
+      class: 'btn view-file js-view-file'
     ) do
       raw('View file @') + content_tag(:span, commit_sha[0..6],
                                        class: 'commit-short-id')

app/views/projects/diffs/_file.html.haml

@@ -5,7 +5,7 @@
     - unless diff_file.submodule?
       .file-actions.hidden-xs
         - if blob_text_viewable?(blob)
-          = link_to '#', class: 'js-toggle-diff-comments btn active has-tooltip btn-file-option', title: "Toggle comments for this file", disabled: @diff_notes_disabled do
+          = link_to '#', class: 'js-toggle-diff-comments btn active has-tooltip', title: "Toggle comments for this file", disabled: @diff_notes_disabled do
             = icon('comment')
           \
           - if editable_diff?(diff_file)

app/views/projects/merge_requests/conflicts/_file_actions.html.haml

@@ -8,5 +8,5 @@
       '@click' => "onClickResolveModeButton(file, 'edit')",
       type: 'button' }
       Edit inline
-  %a.btn.view-file.btn-file-option{ ":href" => "file.blobPath" }
+  %a.btn.view-file{ ":href" => "file.blobPath" }
     View file @{{conflictsData.shortCommitSha}}

changelogs/unreleased/27291-unify-mr-diff-file-buttons.yml

+---
+title: Unify MR diff file button style
+merge_request: 8874
+author: