Admin date widget not working on inlines until after validation failure

[Russell Keith-Magee]

Sample models.py:

class Publisher(models.Model):
   name = models.CharField(max_length=300)

class Book(models.Model):
   name = models.CharField(max_length=300)
   publisher = models.ForeignKey(Publisher)
   pubdate = models.DateField()

admin.py:

class BookInline(admin.TabularInline):
    model = Book
    # extra = 1

class PublisherAdmin(admin.ModelAdmin):
    inlines = [BookInline]

admin.site.register(Publisher, PublisherAdmin)

Test procedure:

1. Create a new publisher
2. Click the "Add a new book" button
3. Set the name of the book.
4. Press the today button. Nothing happens - the date doesn't populate the date field.
5. Press the calendar widget. Select a date. The date doesn't populate the date field.
6. Save the object. This should cause a validation error, as pubdate is a required field
7. Press the today button. It works!
8. Press the calendar widget. It works!

I've observed this using Safari 4.0.4, Firefox 3.5.7, and Chrome 4.0.249.49 (35163) beta on OSX 10.5.8.