Add new system preference for metadata discovery mode (synchronous or asynchronous).

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@32933 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/PropertySheet/DocumentPreference.py

@@ -96,6 +96,13 @@ class DocumentPreference:
       'write_permission': 'Manage properties',
       'preference'  : 1,
       'mode'        : '' },
+    { 'id'          : 'preferred_synchronous_metadata_discovery',
+      'description' : 'Is preferred synchronous metadata discovery',
+      'type'        : 'boolean',
+      'write_permission': 'Manage properties',
+      'default'     : False,
+      'preference'  : 1,
+      'mode'        : '' },
     )
 
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