Fixes #3267 - Issue opened in overview doesn't have previous/next buttons if it was opened before

app/assets/javascripts/app/controllers/ticket_zoom.coffee

@@ -19,7 +19,7 @@ class App.TicketZoom extends App.Controller
     @authenticateCheckRedirect()
 
     @formMeta     = undefined
-    @ticket_id    = params.ticket_id
+    @ticket_id    = parseInt(params.ticket_id)
     @article_id   = params.article_id
     @sidebarState = {}
 
@@ -254,6 +254,11 @@ class App.TicketZoom extends App.Controller
     return if !@attributeBar
     @attributeBar.start()
 
+    if @renderDone && params.overview_id? && @overview_id != params.overview_id
+      @overview_id = params.overview_id
+
+      @renderOverviewNavigator(@el)
+
   # scroll to article if given
   scrollToPosition: (position, delay, article_id) =>
     scrollToDelay = =>
@@ -429,11 +434,7 @@ class App.TicketZoom extends App.Controller
         dir:            App.i18n.dir()
       )
 
-      new App.TicketZoomOverviewNavigator(
-        el:          elLocal.find('.js-overviewNavigatorContainer')
-        ticket_id:   @ticket_id
-        overview_id: @overview_id
-      )
+      @renderOverviewNavigator(elLocal)
 
       new App.TicketZoomTitle(
         object_id:   @ticket_id
@@ -1035,6 +1036,13 @@ class App.TicketZoom extends App.Controller
       article: {}
     App.TaskManager.update(@taskKey, { 'state': @localTaskData })
 
+  renderOverviewNavigator: (parentEl) ->
+    new App.TicketZoomOverviewNavigator(
+      el:          parentEl.find('.js-overviewNavigatorContainer')
+      ticket_id:   @ticket_id
+      overview_id: @overview_id
+    )
+
 class TicketZoomRouter extends App.ControllerPermanent
   requiredPermission: ['ticket.agent', 'ticket.customer']
   constructor: (params) ->

spec/system/ticket/zoom_spec.rb

@@ -1094,6 +1094,7 @@ RSpec.describe 'Ticket zoom', type: :system do
     end
   end
 
+<<<<<<< HEAD
   # https://github.com/zammad/zammad/issues/3260
   describe 'next in overview macro changes URL', authenticated_as: :authenticate do
     let(:ticket_a) { create(:ticket, title: 'ticket a', group: Group.first) }
@@ -1167,4 +1168,39 @@ RSpec.describe 'Ticket zoom', type: :system do
       end
     end
   end
+
+  # https://github.com/zammad/zammad/issues/3267
+  describe 'previous/next buttons are added when open ticket is opened from overview' do
+    let(:ticket_a)          { create(:ticket, title: 'ticket a', group: Group.first) }
+    let(:ticket_b)          { create(:ticket, title: 'ticket b', group: Group.first) }
+
+    # prepare an opened ticket and go to overview
+    before do
+      ticket_a && ticket_b
+
+      visit "ticket/zoom/#{ticket_a.id}"
+
+      await_empty_ajax_queue
+
+      visit 'ticket/view/all_unassigned'
+    end
+
+    it 'adds previous/next buttons to existing ticket' do
+      within :active_content do
+        click_on ticket_a.title
+
+        expect(page).to have_css('.pagination-counter')
+      end
+    end
+
+    it 'keeps previous/next buttons when navigating to overview ticket from elsewhere' do
+      within :active_content do
+        click_on ticket_a.title
+        visit 'dashboard'
+        visit "ticket/zoom/#{ticket_a.id}"
+
+        expect(page).to have_css('.pagination-counter')
+      end
+    end
+  end
 end