Issue index CSV uses currently applied filters

app/finders/issuable_finder.rb

@@ -19,6 +19,7 @@
 #
 class IssuableFinder
   NONE = '0'
+  VALID_PARAMS = %i(scope state group_id project_id milestone_title assignee_id search label_name sort)
 
   attr_accessor :current_user, :params
 

app/views/projects/issues/index.html.haml

@@ -21,7 +21,7 @@
         - if current_user
           = link_to url_for(params.merge(format: :atom, private_token: current_user.private_token)), class: 'btn append-right-10 has-tooltip', title: 'Subscribe' do
             = icon('rss')
-          = link_to namespace_project_issues_path(@project.namespace, @project, :csv), class: 'btn append-right-10 has-tooltip', title: 'Download CSV' do
+          = link_to namespace_project_issues_path(@project.namespace, @project, params.permit(IssuableFinder::VALID_PARAMS).merge(format: :csv)), class: 'btn append-right-10 has-tooltip', title: 'Download CSV' do
             = icon('download')
         - if can? current_user, :create_issue, @project
           = link_to new_namespace_project_issue_path(@project.namespace,

spec/features/issues/csv_spec.rb

@@ -23,6 +23,13 @@ describe 'Issues csv', feature: true do
     expect(csv.count).to eq 31
   end
 
+  it 'uses filters from issue index' do
+    visit namespace_project_issues_path(project.namespace, project, state: :closed)
+    click_on 'Download CSV'
+
+    expect(csv.count).to eq 0
+  end
+
   context 'includes' do
     let(:label1)    { create(:label, project: project, title: 'Feature') }
     let(:label2)    { create(:label, project: project, title: 'labels') }