erp5_corporate_identity: get latest Letter Post for the Letter's preview

bt5/erp5_corporate_identity/SkinTemplateItem/portal_skins/erp5_corporate_identity/Letter_renderForPreview.py

+if context.getSimulationState() in ('started', 'stop', 'delivered') \
+    and context.getAggregate(portal_type='Letter Post') is not None:
+  # Get the latest Letter Post, in case the Letter was sent
+  # more than once. We can load objects into memory, as this case must be
+  # extremeley rare
+  return sorted(
+    context.getAggregateValueList(portal_type='Letter Post'),
+    key=lambda x:x.getCreationDate()
+  )[-1].absolute_url() + "/getData"
+return context.getTextContent()

bt5/erp5_corporate_identity/SkinTemplateItem/portal_skins/erp5_corporate_identity/Letter_renderForPreview.xml

+<?xml version="1.0"?>
+<ZopeData>
+  <record id="1" aka="AAAAAAAAAAE=">
+    <pickle>
+      <global name="PythonScript" module="Products.PythonScripts.PythonScript"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>Script_magic</string> </key>
+            <value> <int>3</int> </value>
+        </item>
+        <item>
+            <key> <string>_bind_names</string> </key>
+            <value>
+              <object>
+                <klass>
+                  <global name="NameAssignments" module="Shared.DC.Scripts.Bindings"/>
+                </klass>
+                <tuple/>
+                <state>
+                  <dictionary>
+                    <item>
+                        <key> <string>_asgns</string> </key>
+                        <value>
+                          <dictionary>
+                            <item>
+                                <key> <string>name_container</string> </key>
+                                <value> <string>container</string> </value>
+                            </item>
+                            <item>
+                                <key> <string>name_context</string> </key>
+                                <value> <string>context</string> </value>
+                            </item>
+                            <item>
+                                <key> <string>name_m_self</string> </key>
+                                <value> <string>script</string> </value>
+                            </item>
+                            <item>
+                                <key> <string>name_subpath</string> </key>
+                                <value> <string>traverse_subpath</string> </value>
+                            </item>
+                          </dictionary>
+                        </value>
+                    </item>
+                  </dictionary>
+                </state>
+              </object>
+            </value>
+        </item>
+        <item>
+            <key> <string>_params</string> </key>
+            <value> <string></string> </value>
+        </item>
+        <item>
+            <key> <string>id</string> </key>
+            <value> <string>Letter_renderForPreview</string> </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+</ZopeData>

bt5/erp5_corporate_identity/SkinTemplateItem/portal_skins/erp5_corporate_identity/Letter_viewPreview/content.xml

@@ -11,6 +11,7 @@
             <value>
               <list>
                 <string>default</string>
+                <string>enabled</string>
                 <string>renderjs_extra</string>
                 <string>title</string>
               </list>
@@ -56,6 +57,12 @@
                       <persistent> <string encoding="base64">AAAAAAAAAAI=</string> </persistent>
                     </value>
                 </item>
+                <item>
+                    <key> <string>enabled</string> </key>
+                    <value>
+                      <persistent> <string encoding="base64">AAAAAAAAAAM=</string> </persistent>
+                    </value>
+                </item>
                 <item>
                     <key> <string>field_id</string> </key>
                     <value> <string></string> </value>
@@ -67,7 +74,7 @@
                 <item>
                     <key> <string>renderjs_extra</string> </key>
                     <value>
-                      <persistent> <string encoding="base64">AAAAAAAAAAM=</string> </persistent>
+                      <persistent> <string encoding="base64">AAAAAAAAAAQ=</string> </persistent>
                     </value>
                 </item>
                 <item>
@@ -85,6 +92,10 @@
                     <key> <string>default</string> </key>
                     <value> <string></string> </value>
                 </item>
+                <item>
+                    <key> <string>enabled</string> </key>
+                    <value> <int>1</int> </value>
+                </item>
                 <item>
                     <key> <string>field_id</string> </key>
                     <value> <string>my_view_mode_text_content</string> </value>
@@ -117,7 +128,7 @@
       <dictionary>
         <item>
             <key> <string>_text</string> </key>
-            <value> <string>python: context.Letter_getPredecessor(context_url=context.getRelativeUrl()).absolute_url()+\'/getData\'</string> </value>
+            <value> <string>python: here.Letter_renderForPreview()</string> </value>
         </item>
       </dictionary>
     </pickle>
@@ -130,7 +141,20 @@
       <dictionary>
         <item>
             <key> <string>_text</string> </key>
-            <value> <string>python: context.Letter_getRenderJSExtraPreviewParameterList(context_url=context.getRelativeUrl())</string> </value>
+            <value> <string>python: here.getAggregate(portal_type="Letter Post")</string> </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+  <record id="4" aka="AAAAAAAAAAQ=">
+    <pickle>
+      <global name="TALESMethod" module="Products.Formulator.TALESField"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>_text</string> </key>
+            <value> <string>python: [(\'editor\', here.getAggregateValue(portal_type=\'Letter Post\', default=context).Base_getEditorFieldPreferredTextEditor()), (\'maximize\', True)]</string> </value>
         </item>
       </dictionary>
     </pickle>