Reset the search filters upon a scope change

Whenever a user changes the search scope from the search results tabs,
the search filters will be reset to their default (i.e. ANY) value.

app/helpers/search_helper.rb

 # frozen_string_literal: true
 
 module SearchHelper
-  SEARCH_PERMITTED_PARAMS = [
+  SEARCH_GENERIC_PARAMS = [
     :search,
     :scope,
     :project_id,
@@ -9,8 +9,6 @@ module SearchHelper
     :repository_ref,
     :snippets,
     :sort,
-    :state,
-    :confidential,
     :force_search_results
   ].freeze
 
@@ -255,7 +253,7 @@ module SearchHelper
     search_params = params
       .merge(search)
       .merge({ scope: scope })
-      .permit(SEARCH_PERMITTED_PARAMS)
+      .permit(SEARCH_GENERIC_PARAMS)
 
     if @scope == scope
       li_class = 'active'

changelogs/unreleased/258209-filters-params-remain-when-switching-tabs.yml

+---
+title: Reset search results filters whenever a user changes scope.
+merge_request: 45808
+author:
+type: fixed

spec/helpers/search_helper_spec.rb

@@ -373,6 +373,19 @@ RSpec.describe SearchHelper do
       expect(link).to have_link('Projects', href: search_path(scope: 'projects', search: 'hello', project_id: 23))
     end
 
+    it 'restricts the params' do
+      expect(self).to receive(:params).and_return(
+        ActionController::Parameters.new(
+          search: 'hello',
+          unknown: 42
+        )
+      )
+
+      link = search_filter_link('projects', 'Projects')
+
+      expect(link).to have_link('Projects', href: search_path(scope: 'projects', search: 'hello'))
+    end
+
     it 'assigns given data attributes on the list container' do
       link = search_filter_link('projects', 'Projects', data: { foo: 'bar' })