TAB misbehavior on newly opened lines

[Barry Warsaw]

Put this in a file

---snipsnip---
class Foo:

    def bar(self):
        pass
---snipsnip---

Now put point at the beginning of the `pass` line and hit C-o. Point should be at the beginning of the line.

Now hit TAB. You get the correct amount of leading whitespace, but instead of point being left at the end of the whitespace, it's left at the beginning of the line.