In select widget, accept items as property or method.

This avoids breaking on some z3c.form versions.
See zopefoundation/z3c.form#44

CHANGES.rst

@@ -14,7 +14,10 @@ New features:
 
 Bug fixes:
 
-- *add item here*
+- In select widget, accept items as property or method.
+  This avoids breaking on some z3c.form versions.
+  See https://github.com/zopefoundation/z3c.form/issues/44
+  [maurits]
 
 
 1.2.1 (2016-04-29)

plone/app/z3cform/widget.py

@@ -255,8 +255,16 @@ def _base_args(self):
         if not self.required:
             options['allowClear'] = True
 
+        base_items = self.items
+        if callable(base_items):
+            # items used to be a property in all widgets, then in the select
+            # widget it became a method, then in a few others too, but never in
+            # all, so this was reverted to let it be a property again.  Let's
+            # support both here to avoid breaking on some z3c.form versions.
+            # See https://github.com/zopefoundation/z3c.form/issues/44
+            base_items = base_items()
         items = []
-        for item in self.items():
+        for item in base_items:
             if not isinstance(item['content'], basestring):
                 item['content'] = translate(
                     item['content'],