Allow customizing Dict keys order

We add a sequence attribute to the key definition and use it for sorting.
This attribute is filled by the field sequence if it exists (using
sequence_ordered) or by the key name.

issue8373
review275431002

CHANGELOG

@@ -1,3 +1,4 @@
+* Order Dict keys by sequence
 * Support relation fields in domain parser
 * Add Dict widget for tree view
 * Add handle to reordable line of tree views

tryton/gui/window/view_form/view/form_gtk/dictionary.py

@@ -473,9 +473,16 @@ class DictWidget(Widget):
         if new_key_names:
             self.field.add_keys(list(new_key_names), self.record)
         decoder = PYSONDecoder()
-        for key, val in sorted(value.items()):
-            if key not in self.field.keys:
-                continue
+
+        def filter_func(item):
+            key, value = item
+            return key in self.field.keys
+
+        def key(item):
+            key, value = item
+            return self.field.keys[key]['sequence'] or 0
+
+        for key, val in sorted(filter(filter_func, value.items()), key=key):
             if key not in self.fields:
                 self.add_line(key)
             widget = self.fields[key]