Expose whether total_size is the same as limit.

Allows telling user whether what he sees is the whole result set, or just
a limited sample of it.

product/ERP5Form/ListBox.py

@@ -2018,6 +2018,7 @@ class ListBoxRenderer:
 
     # Set the total number of objects.
     self.total_size = sum([s.object_list_len for s in report_section_list])
+    self.is_sample = self.total_size == int(param_dict.get('limit', -1))
 
     # Calculuate the start and the end offsets, and set the page numbers.
     if max_lines == 0: