Move 'ApplicationDefaultPermissiosn' from 'App.class_init' to 'AccessControl.Permissions'.

o This move breaks an import cycle in third-party code which avoids imports
  from 'Globals.'
  
o Leave the class importable from its old location without deprecation.

doc/CHANGES.txt

@@ -6,6 +6,13 @@ Zope Changes
 
   Zope 2.10.8 (unreleased)
 
+    Restructuring
+
+      - Moved 'ApplicationDefaultPermissiosn' from 'App.class_init' to
+        'AccessControl.Permissions', in order to break an import cycle
+        in third-party code which avoids imports from 'Globals.'  Left
+        the class importable from its old location without deprecation.
+
     Bugs fixed
 
       - Products.PluginIndexes.PathIndex:  backported doc fixes /

lib/python/AccessControl/Permission.py

@@ -136,3 +136,7 @@ def registerPermissions(permissions, defaultDefault=('Manager',)):
         if not hasattr(Globals.ApplicationDefaultPermissions, mangled):
             setattr(Globals.ApplicationDefaultPermissions,
                     mangled, default)
+
+class ApplicationDefaultPermissions:
+    _View_Permission = ('Manager', 'Anonymous')
+    _Access_contents_information_Permission = ('Manager', 'Anonymous')

lib/python/App/class_init.py

@@ -12,12 +12,10 @@
 ##############################################################################
 
 import logging
-from AccessControl.PermissionRole import PermissionRole
-import AccessControl.Permission
 
-class ApplicationDefaultPermissions:
-    _View_Permission='Manager', 'Anonymous'
-    _Access_contents_information_Permission='Manager', 'Anonymous'
+from AccessControl.Permission import ApplicationDefaultPermissions # BBB
+from AccessControl.Permission import registerPermissions
+from AccessControl.PermissionRole import PermissionRole
 
 
 def default__class_init__(self):
@@ -66,7 +64,7 @@ def default__class_init__(self):
             break
 
     if self.__dict__.has_key('__ac_permissions__'):
-        AccessControl.Permission.registerPermissions(self.__ac_permissions__)
+        registerPermissions(self.__ac_permissions__)
         for acp in self.__ac_permissions__:
             pname, mnames = acp[:2]
             if len(acp) > 2: