Fixed #26129 -- Made invalid forms display initial values of disabled fields.

django/forms/fields.py

@@ -167,6 +167,8 @@ class Field(object):
         For most fields, this will simply be data; FileFields need to handle it
         a bit differently.
         """
+        if self.disabled:
+            return initial
         return data
 
     def widget_attrs(self, widget):