Merge branch 'fix_quick_submit_missing_in_edit_merge_request' into 'master'

Fix quick submit missing in edit merge request page

closes #14953 

![fix](/uploads/5b80b37330929514c81299b4c8fe3efb/fix.gif)

See merge request !3601

app/views/projects/merge_requests/_form.html.haml

-= form_for [@project.namespace.becomes(Namespace), @project, @merge_request], html: { class: 'merge-request-form form-horizontal gfm-form js-requires-input' } do |f|
+= form_for [@project.namespace.becomes(Namespace), @project, @merge_request], html: { class: 'merge-request-form form-horizontal gfm-form js-requires-input js-quick-submit' } do |f|
   = render 'shared/issuable/form', f: f, issuable: @merge_request
 
 :javascript

spec/features/merge_requests/edit_mr_spec.rb

+require 'spec_helper'
+
+feature 'Edit Merge Request', feature: true do
+  let(:user) { create(:user) }
+  let(:project) { create(:project, :public) }
+  let(:merge_request) { create(:merge_request, :with_diffs, source_project: project) }
+
+  before do
+    project.team << [user, :master]
+
+    login_as user
+
+    visit edit_namespace_project_merge_request_path(project.namespace, project, merge_request)
+  end
+
+  context 'editing a MR' do
+    it 'form should have class js-quick-submit' do
+      expect(page).to have_selector('.js-quick-submit')
+    end
+  end
+end