Fixes #3831 - Ticket zoom will loose attachments on rerender.

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

@@ -501,8 +501,14 @@ class App.TicketZoom extends App.Controller
         defaults:                     @taskGet('article')
         taskKey:                      @taskKey
         ui:                           @
-        callbackFileUploadStart: @submitDisable
+        richTextUploadStartCallback:  @submitDisable
-        callbackFileUploadStop:  @submitEnable
+        richTextUploadRenderCallback: (attachments) =>
+          @submitEnable()
+          @taskUpdateAttachments('article', attachments)
+          @delay(@markForm, 250, 'ticket-zoom-form-update')
+        richTextUploadDeleteCallback: (attachments) =>
+          @taskUpdateAttachments('article', attachments)
+          @delay(@markForm, 250, 'ticket-zoom-form-update')
       )
 
       @highligher = new App.TicketZoomHighlighter(
@@ -721,7 +727,7 @@ class App.TicketZoom extends App.Controller
     # add attachments if exist
     attachmentCount = @$('.article-add .textBubble .attachments .attachment').length
     if attachmentCount > 0
-      currentParams.article.attachments = true
+      currentParams.article.attachments = attachmentCount
     else
       delete currentParams.article.attachments
 
@@ -1079,6 +1085,13 @@ class App.TicketZoom extends App.Controller
 
     App.TaskManager.update(@taskKey, taskData)
 
+  taskUpdateAttachments: (area, attachments) =>
+    taskData = App.TaskManager.get(@taskKey)
+    return if !taskData
+
+    taskData.attachments = attachments
+    App.TaskManager.update(@taskKey, taskData)
+
   taskUpdateAll: (data) =>
     @localTaskData = data
     @localTaskData.article['form_id'] = @form_id
@@ -1101,7 +1114,7 @@ class App.TicketZoom extends App.Controller
     @localTaskData =
       ticket:  {}
       article: {}
-    App.TaskManager.update(@taskKey, { 'state': @localTaskData })
+    App.TaskManager.update(@taskKey, { 'state': @localTaskData, attachments: [] })
 
   renderOverviewNavigator: (parentEl) ->
     new App.TicketZoomOverviewNavigator(

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

@@ -198,17 +198,17 @@ class App.TicketZoomArticleNew extends App.Controller
       inputField:             @$('.article-attachment input')
 
       onFileStartCallback: =>
-        @callbackFileUploadStart?()
+        @richTextUploadStartCallback?()
 
       onFileCompletedCallback: (response) =>
         @attachments.push response.data
         @renderAttachment(response.data)
         @$('.article-attachment input').val('')
 
-        @callbackFileUploadStop?()
+        @richTextUploadRenderCallback?(@attachments)
 
       onFileAbortedCallback: =>
-        @callbackFileUploadStop?()
+        @richTextUploadRenderCallback?(@attachments)
 
       attachmentPlaceholder: @attachmentPlaceholder
       attachmentUpload:      @attachmentUpload
@@ -287,7 +287,6 @@ class App.TicketZoomArticleNew extends App.Controller
       params.preferences ||= {}
       params.preferences.security = @paramsSecurity()
 
-    params.attachments = @attachments
     params
 
   validate: =>
@@ -624,6 +623,8 @@ class App.TicketZoomArticleNew extends App.Controller
       $(e.currentTarget).closest('.attachment').remove()
       if element.find('.attachment').length == 0
         element.empty()
+
+      @richTextUploadDeleteCallback?(@attachments)
     )
 
   actions: ->

spec/system/ticket/zoom_spec.rb

@@ -2011,13 +2011,13 @@ RSpec.describe 'Ticket zoom', type: :system do
     end
 
     def expect_upload_and_text
-      expect(page).to have_text('mail001.box')
+      expect(page.find('.article-new')).to have_text('mail001.box')
-      expect(page).to have_text("Hello\nThis\nis\nimportant!\nyo\nhoho\ntest test test test")
+      expect(page.find('.article-new')).to have_text("Hello\nThis\nis\nimportant!\nyo\nhoho\ntest test test test")
     end
 
     def expect_no_upload_and_text
-      expect(page).to have_no_text('mail001.box')
+      expect(page.find('.article-new')).to have_no_text('mail001.box')
-      expect(page).to have_no_text("Hello\nThis\nis\nimportant!\nyo\nhoho\ntest test test test")
+      expect(page.find('.article-new')).to have_no_text("Hello\nThis\nis\nimportant!\nyo\nhoho\ntest test test test")
     end
 
     it 'does show up the attachments after a reload of the page' do
@@ -2044,6 +2044,55 @@ RSpec.describe 'Ticket zoom', type: :system do
       refresh
       expect_no_upload_and_text
     end
+
+    context 'when rerendering (#3831)' do
+      def rerender
+        page.evaluate_script("App.Event.trigger('ui:rerender')")
+      end
+
+      it 'does loose attachments after rerender' do
+        upload_and_set_text
+        expect_upload_and_text
+        rerender
+        expect_upload_and_text
+      end
+
+      it 'does not readd the attachments after reset' do
+        upload_and_set_text
+        expect_upload_and_text
+
+        page.find('.js-reset').click
+        wait_for_upload_blank
+        expect_no_upload_and_text
+        rerender
+        expect_no_upload_and_text
+      end
+
+      it 'does not readd the attachments after submit' do
+        upload_and_set_text
+        expect_upload_and_text
+
+        page.find('.js-submit').click
+        wait_for_upload_blank
+        expect_no_upload_and_text
+        rerender
+        expect_no_upload_and_text
+      end
+
+      it 'does not show the ticket as changed after the upload removal' do
+        page.find('input#fileUpload_1', visible: :all).set(Rails.root.join('test/data/mail/mail001.box'))
+        expect(page.find('.article-new')).to have_text('mail001.box')
+        wait_for_upload_present
+        begin
+          page.evaluate_script("$('div.attachment-delete.js-delete:last').click()") # not interactable
+        rescue # Lint/SuppressedException
+          # because its not interactable it also
+          # returns this weird exception for the jquery
+          # even tho it worked fine
+        end
+        expect(page).to have_no_selector('.js-reset')
+      end
+    end
   end
 
   describe 'Unable to close tickets in certran cases if core workflow is used #3710', authenticated_as: :authenticate, db_strategy: :reset do