Fix linking to new issue with selected template

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/26595

app/helpers/issuables_helper.rb

@@ -251,6 +251,6 @@ module IssuablesHelper
   end
 
   def selected_template(issuable)
-    params[:issuable_template] if issuable_templates(issuable).include?(params[:issuable_template])
+    params[:issuable_template] if issuable_templates(issuable).any?{ |template| template[:name] == params[:issuable_template] }
   end
 end

changelogs/unreleased/26595-fix-issue-preselected-template.yml

+---
+title: Fix linking to new issue with selected template via url parameter
+merge_request:
+author:

spec/features/issues_spec.rb

@@ -13,6 +13,13 @@ describe 'Issues', feature: true do
     user2 = create(:user)
 
     project.team << [[@user, user2], :developer]
+
+    project.repository.create_file(
+      @user,
+      '.gitlab/issue_templates/bug.md',
+      'this is a test "bug" template',
+      message: 'added issue template',
+      branch_name: 'master')
   end
 
   describe 'Edit issue' do
@@ -600,6 +607,16 @@ describe 'Issues', feature: true do
         expect(page.find_field("issue_description").value).to match /\n\n$/
       end
     end
+
+    context 'form filled by URL parameters' do
+      before do
+        visit new_namespace_project_issue_path(project.namespace, project, issuable_template: 'bug')
+      end
+
+      it 'fills in template' do
+        expect(find('.js-issuable-selector .dropdown-toggle-text')).to have_content('bug')
+      end
+    end
   end
 
   describe 'new issue by email' do