Keep branch when going to Pipeline Editor through nav

When going to the pipeline editor through the menu, we
should preserve the branch the user was currently on.
This now passes the current ref in the nav item
so that we can load the right ref context right
when arriving in the pipeline editor.

Changelog: changed

ee/spec/lib/ee/sidebars/projects/menus/ci_cd_menu_spec.rb

@@ -5,7 +5,7 @@ require 'spec_helper'
 RSpec.describe Sidebars::Projects::Menus::CiCdMenu do
   let(:project) { build(:project) }
   let(:user) { project.owner }
-  let(:context) { Sidebars::Projects::Context.new(current_user: user, container: project, can_view_pipeline_editor: true) }
+  let(:context) { Sidebars::Projects::Context.new(current_user: user, current_ref: 'main', container: project, can_view_pipeline_editor: true) }
 
   describe 'Test Cases' do
     subject { described_class.new(context).renderable_items.index { |e| e.item_id == :test_cases} }

lib/sidebars/projects/menus/ci_cd_menu.rb

@@ -68,9 +68,13 @@ module Sidebars
             return ::Sidebars::NilMenuItem.new(item_id: :pipelines_editor)
           end
 
+          params = {
+            branch_name: context.current_ref || context.project.default_branch
+          }
+
           ::Sidebars::MenuItem.new(
             title: s_('Pipelines|Editor'),
-            link: project_ci_pipeline_editor_path(context.project),
+            link: project_ci_pipeline_editor_path(context.project, params),
             active_routes: { path: 'projects/ci/pipeline_editor#show' },
             item_id: :pipelines_editor
           )

spec/views/layouts/nav/sidebar/_project.html.haml_spec.rb

@@ -286,10 +286,20 @@ RSpec.describe 'layouts/nav/sidebar/_project' do
     end
 
     describe 'Pipeline Editor' do
-      it 'has a link to the pipeline editor' do
-        render
+      context 'with a current_ref' do
+        it 'has a link to the pipeline editor' do
+          render
+
+          expect(rendered).to have_link('Editor', href: project_ci_pipeline_editor_path(project, params: { branch_name: current_ref }))
+        end
+      end
+
+      context 'with the default_branch' do
+        it 'has a link to the pipeline editor' do
+          render
 
-        expect(rendered).to have_link('Editor', href: project_ci_pipeline_editor_path(project))
+          expect(rendered).to have_link('Editor', href: project_ci_pipeline_editor_path(project, params: { branch_name: project.default_branch }))
+        end
       end
 
       context 'when user cannot access pipeline editor' do