Add Merge Request button to branches page.

CHANGELOG

@@ -49,7 +49,7 @@ v 7.11.0 (unreleased)
   - Add footnotes support to Markdown (Guillaume Delbergue)
   - Add current_sign_in_at to UserFull REST api.
   - Make Sidekiq MemoryKiller shutdown signal configurable
-  - Add "Create Merge Request" buttons to commits page and push event.
+  - Add "Create Merge Request" buttons to commits and branches pages and push event.
 v 7.10.2
   - Fix CI links on MR page

app/views/projects/branches/_branch.html.haml

@@ -10,16 +10,19 @@
           %i.fa.fa-lock
           protected
     .pull-right
-      - if can?(current_user, :download_code, @project)
-        = render 'projects/repositories/download_archive', ref: branch.name, btn_class: 'btn-grouped btn-group-xs'
+      - if create_mr_button?(@repository.root_ref, branch.name)
+        = link_to create_mr_path(@repository.root_ref, branch.name), class: 'btn btn-grouped btn-xs' do
+          = icon('plus')
+          Merge Request
+
       - if branch.name != @repository.root_ref
         = link_to namespace_project_compare_index_path(@project.namespace, @project, from: @repository.root_ref, to: branch.name), class: 'btn btn-grouped btn-xs', method: :post, title: "Compare" do
-          %i.fa.fa-files-o
+          = icon("exchange")
           Compare
       - if can_remove_branch?(@project, branch.name)
         = link_to namespace_project_branch_path(@project.namespace, @project, branch.name), class: 'btn btn-grouped btn-xs btn-remove remove-row', method: :delete, data: { confirm: 'Removed branch cannot be restored. Are you sure?'}, remote: true do
-          %i.fa.fa-trash-o
+          = icon("trash-o")
   - if commit
     %ul.list-unstyled