Make Item a subclass of Navigation

This allows rendering the templates on navigation in the context of the current element, instead of finding the attributes through acquisition, which would then render them in the context of the containing folder, thus making it impossible to have the correct ‚title‘ attribute for non Navigation elements.

src/OFS/SimpleItem.py

@@ -52,6 +52,7 @@
 from zExceptions.ExceptionFormatter import format_exception
 from zope.interface import implementer
 
+from App.Management import Navigation
 from OFS import bbb
 from OFS.interfaces import IItem
 from OFS.interfaces import IItemWithName
@@ -72,6 +73,7 @@
 
 @implementer(IItem)
 class Item(Base,
+           Navigation,
            Resource,
            LockableItem,
            CopySource,