Bugfix: categories are shown on process update

These changes fix a bug that causes categories
of a legislation process to be wiped on update
of the process. It also adds a regression test
for this fix.

app/controllers/admin/legislation/processes_controller.rb

@@ -24,8 +24,6 @@ class Admin::Legislation::ProcessesController < Admin::Legislation::BaseControll
 
   def update
     if @process.update(process_params)
-      set_tag_list
-
       link = legislation_process_path(@process)
       redirect_back(fallback_location: (request.referer || root_path),
                     notice: t("admin.legislation.processes.update.notice", link: link))
@@ -77,11 +75,6 @@ class Admin::Legislation::ProcessesController < Admin::Legislation::BaseControll
       ]
     end
 
-    def set_tag_list
-      @process.set_tag_list_on(:customs, process_params[:custom_list])
-      @process.save!
-    end
-
     def resource
       @process || ::Legislation::Process.find(params[:id])
     end

spec/features/admin/legislation/processes_spec.rb

@@ -249,6 +249,13 @@ describe "Admin collaborative legislation" do
 
       visit admin_legislation_process_proposals_path(process)
       expect(page).to have_field("Categories", with: "bicycles, recycling")
+
+      within(".admin-content") { click_link "Information" }
+      fill_in "Summary", with: "Summarizing the process"
+      click_button "Save changes"
+
+      visit admin_legislation_process_proposals_path(process)
+      expect(page).to have_field("Categories", with: "bicycles, recycling")
     end
 
     scenario "Edit milestones summary", :js do