[FIX] api: share protected among environments

If a field is protected against recomputation, it must be protected in
*all* environments.

odoo/api.py

@@ -452,7 +452,7 @@ class Environment(Mapping):
         self.cr, self.uid, self.context, self.su = self.args = args
         self.registry = Registry(cr.dbname)
         self.cache = envs.cache
-        self._protected = StackMap()                # {field: ids, ...}
+        self._protected = envs.protected        # proxy to shared data structure
         self.all = envs
         envs.add(self)
         return self
@@ -668,6 +668,7 @@ class Environments(object):
     def __init__(self):
         self.envs = WeakSet()                   # weak set of environments
         self.cache = Cache()                    # cache for all records
+        self.protected = StackMap()             # fields to protect {field: ids, ...}
         self.tocompute = defaultdict(set)       # recomputations {field: ids}
         # updates {model: {id: {field: value}}}
         self.towrite = defaultdict(lambda: defaultdict(dict))

odoo/fields.py

@@ -2569,9 +2569,6 @@ class _RelationalMulti(_Relational):
                     cache.set(record, self, val)
                 else:
                     result = False
-            # DEEP FUCKING HACK TO FIX SOMEDAY: recs.env is different from
-            # records.env; we must trigger modifications in the original env
-            recs.env._protected = records.env._protected
             recs.modified([self.name])
 
         return result