erp5_open_trade: do not reexpand simulation if there is no simulation movement to create

expand always reindex the full simulation tree, even if there is nothing to do.
This is cpu costly.

bt5/erp5_open_trade/SkinTemplateItem/portal_skins/erp5_open_trade/OpenOrder_updateSimulation.py

@@ -3,6 +3,8 @@ if context.checkConsistency():
   return
 
 subscription_item_set = set()
+now = DateTime().earliestTime()
+portal = context.getPortalObject()
 
 for open_order_line in context.objectValues():
   for ob in [open_order_line] + open_order_line.getCellValueList():
@@ -10,4 +12,17 @@ for open_order_line in context.objectValues():
       if getattr(item.aq_explicit, 'updateSimulation', None) is not None and \
           item not in subscription_item_set:
         subscription_item_set.add(item)
-        item.updateSimulation(expand_root=1)
+        stop_date = item.getNextPeriodicalDate(now)
+        # Do not expand subscription item if there is
+        # no new simulation movement to create
+        # (expand always reindex the full simulation tree,
+        # which can be cpu costly when we have many hosting subscription)
+        simulation_movement_list = portal.portal_simulation.getMovementHistoryList(
+          portal_type='Simulation Movement',
+          aggregate__uid=item.getUid(),
+          from_date=stop_date,
+          at_date=stop_date,
+          only_accountable=False,
+        )
+        if len(simulation_movement_list) == 0:
+          item.updateSimulation(expand_root=1)