Ticket #9376: sneaky_initial.diff

django/forms/fields.py

@@ -442 +442 @@
 
 class FileField(Field):
     widget = FileInput
+    sneaky_initial = True
     default_error_messages = {
         'invalid': _(u"No file was submitted. Check the encoding type on the form."),
         'missing': _(u"No file was submitted."),

django/forms/forms.py

@@ -224 +224 @@
             # widgets split data over several HTML fields.
             value = field.widget.value_from_datadict(self.data, self.files, self.add_prefix(name))
             try:
-                if isinstance(field, FileField):
+                if getattr(field, 'sneaky_initial', False):
                     initial = self.initial.get(name, field.initial)
                     value = field.clean(value, initial)
                 else: