Fixed #13174 -- Fixed missing field label for readonly_fields when used in StackedInline, thanks to benc for the report and ptone for the investigation and initial patch.

* Corrected `InlineAdminForm.__init__` to pass along `model_admin` parameter in `super` call.
 * Lookup the field label in the form's model, not the `model_admin` model.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@12857 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/admin_inlines/models.py

@@ -38,11 +38,13 @@ class Holder(models.Model):
 class Inner(models.Model):
     dummy = models.IntegerField()
     holder = models.ForeignKey(Holder)
+    readonly = models.CharField("Inner readonly label", max_length=1)
 
 
 class InnerInline(admin.StackedInline):
     model = Inner
     can_delete = False
+    readonly_fields = ('readonly',) # For bug #13174 tests.
 
 
 class Holder2(models.Model):