Fixes #3816 - Zammad 5 mail template double signature.

app/assets/javascripts/app/controllers/agent_ticket_create/form_handler_signature.coffee

@@ -1,4 +1,4 @@
-class TicketCreateFormHanderSignature
+class TicketCreateFormHandlerSignature
 
   @run: (params, attribute, attributes, classname, form, ui) ->
     return if !attribute
@@ -19,10 +19,7 @@ class TicketCreateFormHanderSignature
         if App.Utils.signatureCheck(currentBody.html() || '', signatureFinished)
 
           # if signature has changed, in case remove old signature
-          signature_id = ui.el.closest('.content').find('[data-signature=true]').data('signature-id')
+          ui.el.closest('.content').find('[data-signature="true"]').remove()
-          if signature_id && signature_id.toString() isnt signature.id.toString()
-
-            ui.el.closest('.content').find('[data-signature="true"]').remove()
 
           if !App.Utils.htmlLastLineEmpty(currentBody)
             currentBody.append('<br><br>')
@@ -35,4 +32,4 @@ class TicketCreateFormHanderSignature
     else
       ui.el.closest('.content').find('[data-name="body"]').find('[data-signature=true]').remove()
 
-App.Config.set('200-ticketFormSignature', TicketCreateFormHanderSignature, 'TicketCreateFormHandler')
+App.Config.set('200-ticketFormSignature', TicketCreateFormHandlerSignature, 'TicketCreateFormHandler')

spec/system/ticket/create_spec.rb

@@ -829,4 +829,32 @@ RSpec.describe 'Ticket Create', type: :system do
       expect(page.find('.richtext-content')).to have_text('Support')
     end
   end
+
+  describe 'Zammad 5 mail template double signature #3816', authenticated_as: :authenticate do
+    let(:agent_template) { create(:agent) }
+    let!(:template) do
+      create(
+        :template,
+        :dummy_data,
+        group: Group.first, owner: agent_template,
+        body: 'Content dummy.<br><br><div data-signature="true" data-signature-id="1">  Test Other Agent<br><br>--<br> Super Support - Waterford Business Park<br> 5201 Blue Lagoon Drive - 8th Floor &amp; 9th Floor - Miami, 33126 USA<br> Email: hot@example.com - Web: <a href="http://www.example.com/" rel="nofollow noreferrer noopener" target="_blank">http://www.example.com/</a><br>--</div>'
+      )
+    end
+
+    def authenticate
+      Group.first.update(signature: Signature.first)
+      true
+    end
+
+    before do
+      visit 'ticket/create'
+      find('[data-type=email-out]').click
+    end
+
+    it 'does not show double signature on template usage' do
+      select Group.first.name, from: 'group_id'
+      use_template(template)
+      expect(page).to have_no_text('Test Other Agent')
+    end
+  end
 end