Fix #7740 (Star count from added columns doubled in book detatils block). Also store queries generated by the advanced search dialog in the search history

src/calibre/ebooks/metadata/book/base.py

@@ -531,6 +531,8 @@ class Metadata(object):
                 res = format_date(res, cmeta['display'].get('date_format','dd MMM yyyy'))
             elif datatype == 'bool':
                 res = _('Yes') if res else _('No')
+            elif datatype == 'rating':
+                res = res/2
             return (name, unicode(res), orig_res, cmeta)
 
         # Translate aliases into the standard field name

src/calibre/gui2/search_box.py

@@ -384,7 +384,7 @@ class SearchBoxMixin(object): # {{{
     def do_advanced_search(self, *args):
         d = SearchDialog(self, self.library_view.model().db)
         if d.exec_() == QDialog.Accepted:
-            self.search.set_search_string(d.search_string())
+            self.search.set_search_string(d.search_string(), store_in_history=True)
 
     def do_search_button(self):
         self.search.do_search()