Don't reload records when sorting if there are unsaved records

issue2664
review403001

tryton/gui/window/view_form/view/list_gtk/parser.py

@@ -64,13 +64,11 @@ def sort_model(column, treeview, screen):
     store = treeview.get_model()
     unsaved_records = [x for x in store.group if x.id < 0]
     search_string = screen.screen_container.get_text() or None
-    if screen.search_count == len(store):
+    if screen.search_count == len(store) or unsaved_records:
         ids = screen.search_filter(search_string=search_string, only_ids=True)
         store.sort(ids)
     else:
         screen.search_filter(search_string=search_string)
-    for record in unsaved_records:
-        store.group.append(record)
 
 
 def realized(func):