[FIX] mail: server action: do not send directly email notifications

This is a backport of a fix in 9, revision 890f1302c7175e24887e66a2f8b973e72fb4c7e9.
In this revision a context key is added wshen evaluating server actions.
Notification emails created during a server action will be set in the queue
and not send directly.

addons/email_template/ir_actions.py

@@ -79,5 +79,18 @@ class actions_server(osv.Model):
                                               force_send=False, raise_exception=False, context=context)
         return False
 
+    def _get_eval_context(self, cr, uid, action, context=None):
+        """ Override the method giving the evaluation context but also the
+        context used in all subsequent calls. Add the mail_notify_force_send
+        key set to False in the context. This way all notification emails linked
+        to the currently executed action will be set in the queue instead of
+        sent directly. This will avoid possible break in transactions. """
+        eval_context = super(actions_server, self)._get_eval_context(cr, uid, action, context=context)
+        # re-dictify, because eval_context['context'] is a frozendict
+        ctx = dict(eval_context.get('context', {}))
+        ctx['mail_notify_force_send'] = False
+        eval_context['context'] = ctx
+        return eval_context
+
 
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