fix can't delete embedded file

See merge request nexedi/erp5!1781

bt5/erp5_base/WorkflowTemplateItem/portal_workflow/embedded_workflow/state_embedded.xml

@@ -12,6 +12,21 @@
               <tuple/>
             </value>
         </item>
+        <item>
+            <key> <string>categories</string> </key>
+            <value>
+              <tuple>
+                <string>destination/portal_workflow/embedded_workflow/transition_delete</string>
+                <string>destination/portal_workflow/embedded_workflow/transition_delete_action</string>
+              </tuple>
+            </value>
+        </item>
+        <item>
+            <key> <string>comment</string> </key>
+            <value>
+              <none/>
+            </value>
+        </item>
         <item>
             <key> <string>description</string> </key>
             <value> <string>This document is embedded (i.e. acquire its security from container)</string> </value>

bt5/erp5_core_test/TestTemplateItem/portal_components/test.erp5.testERP5Base.py

@@ -1533,6 +1533,16 @@ class TestERP5Base(ERP5TypeTestCase):
     self.assertEqual('text/xml', embedded_file.getContentType())
     self.assertEqual('text/xml', embedded_file.getProperty('content_type'))
 
+  def test_EmbeddedFile_workflow(self):
+    embedded_file = self.portal.person_module.newContent(
+        portal_type='Person'
+    ).newContent(
+        portal_type='Embedded File'
+    )
+    self.assertEqual('embedded', embedded_file.getValidationState())
+    self.portal.portal_workflow.doActionFor(embedded_file, 'delete_action')
+    self.assertEqual('deleted', embedded_file.getValidationState())
+
   def test_BankAccount_validateIBAN(self):
     self.assertTrue(
         self.portal.BankAccount_validateIBAN(