template(XMLUI): added items property to ListWidget:

this property get values and labels from items relevant for the current list, according to styles.

src/tools/common/template_xmlui.py

@@ -75,11 +75,17 @@ class OptionsWidget(Widget):
 
     @property
     def labels(self):
-        ret = []
+        """return only labels from self.items"""
+        for value, label in self.items:
+            yield label
+
+    @property
+    def items(self):
+        """return suitable items, according to style"""
+        no_select = self.no_select
         for value,label in self.options:
-            if value in self.selected:
-                ret.append(label)
-        return ret
+            if no_select or value in self.selected:
+                yield value,label
 
     @property
     def inline(self):