Fixes #2406 - Forwarding: Attachment of original content gets removed starting from the second forward without reloading per ticket

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

@@ -1005,9 +1005,12 @@ class App.TicketZoom extends App.Controller
   # reset task state
   taskReset: =>
     @form_id = App.ControllerForm.formId()
+
     @articleNew.form_id = @form_id
     @articleNew.render()
 
+    @articleView.updateFormId(@form_id)
+
     @localTaskData =
       ticket:  {}
       article: {}

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

@@ -60,6 +60,9 @@ class App.TicketZoomArticleView extends App.Controller
 
     false
 
+  updateFormId: (newFormId) ->
+    for id, viewItem of @articleController
+      viewItem.updateFormId(newFormId)
 
 class ArticleViewItem extends App.ObserverController
   model: 'TicketArticle'
@@ -205,7 +208,7 @@ class ArticleViewItem extends App.ObserverController
       size:      40
     )
 
-    new App.TicketZoomArticleActions(
+    @articleActions = new App.TicketZoomArticleActions(
       el:              @$('.js-article-actions')
       ticket:          @ticket
       article:         article
@@ -425,3 +428,6 @@ class ArticleViewItem extends App.ObserverController
     e.preventDefault()
     e.stopPropagation()
     new App.TicketZoomArticleImageView(image: $(e.target).get(0).outerHTML, parentElement: $(e.currentTarget))
+
+  updateFormId: (newFormId) ->
+    @articleActions?.form_id = newFormId

spec/system/ticket/zoom_spec.rb

@@ -126,7 +126,50 @@ RSpec.describe 'Ticket zoom', type: :system do
         end
       end
     end
-
   end
 
+  context 'when ticket has an attachment' do
+
+    let(:group)           { Group.find_by(name: 'Users') }
+    let(:ticket)          { create(:ticket, group: group) }
+    let(:article)         { create(:ticket_article, ticket: ticket) }
+    let(:attachment_name) { 'some_file.txt' }
+
+    before do
+      Store.add(
+        object:        'Ticket::Article',
+        o_id:          article.id,
+        data:          'some content',
+        filename:      attachment_name,
+        preferences:   {
+          'Content-Type' => 'text/plain',
+        },
+        created_by_id: 1,
+      )
+    end
+
+    context 'article was already forwarded once' do
+      before do
+        visit "#ticket/zoom/#{ticket.id}"
+
+        within(:active_content) do
+          find('a[data-type=emailForward]').click
+
+          click('.js-reset')
+          have_no_css('.js-reset')
+        end
+      end
+
+      it 'adds attachments when forwarding multiple times' do
+
+        within(:active_content) do
+          find('a[data-type=emailForward]').click
+        end
+
+        within('.js-writeArea') do
+          expect(page).to have_text attachment_name
+        end
+      end
+    end
+  end
 end