Remove double slashes from urls generated by PseudonymizationHelper

app/helpers/routing/pseudonymization_helper.rb

@@ -15,7 +15,7 @@ module Routing
       end
 
       def mask_params
-        return default_root_url + @request.original_fullpath unless has_maskable_params?
+        return @request.original_url unless has_maskable_params?
 
         masked_params = @request.path_parameters.to_h do |key, value|
           case key
@@ -66,10 +66,6 @@ module Routing
 
         query_string_hash
       end
-
-      def default_root_url
-        Gitlab::Routing.url_helpers.root_url(only_path: false)
-      end
     end
 
     def masked_page_url(group:, project:)

spec/helpers/routing/pseudonymization_helper_spec.rb

@@ -222,16 +222,26 @@ RSpec.describe ::Routing::PseudonymizationHelper do
   end
 
   describe 'when url has no params to mask' do
-    let(:root_url) { 'http://localhost/some/path' }
+    let(:original_url) { 'http://localhost/-/security/vulnerabilities' }
+    let(:request) do
+      double(:Request,
+             path_parameters: {
+               controller: 'security/vulnerabilities',
+               action: 'index'
+             },
+             protocol: 'http',
+             host: 'localhost',
+             query_string: '',
+             original_fullpath: '/-/security/vulnerabilities',
+             original_url: original_url)
+    end
 
-    context 'returns root url' do
-      before do
-        controller.request.path = 'some/path'
-      end
+    before do
+      allow(helper).to receive(:request).and_return(request)
+    end
 
-      it 'masked_page_url' do
-        expect(subject).to eq(root_url)
-      end
+    it 'returns unchanged url' do
+      expect(subject).to eq(original_url)
     end
   end