header taller than row causes bumpy scrolling

[GoogleCodeExporter]

What steps will reproduce the problem?
1. create a header that is taller than a row.
2. the calculation of the scroll of the header is based only on the top row.
3. Since the last row of a section can disappear before the next to last row of 
a section is still the 0th child (listview.getChild(0)), the calculation will 
not start scrolling until the last row of the section becomes the 0th child of 
the listview.

What is the expected output? What do you see instead?

Expect that the view will scroll smoothly.

What version of the product are you using? On what operating system?

Current version on Android 2.3.4.

Please provide any additional information below.

Will supply diff listing which fixes issue shortly.

Original issue reported on code.google.com by [email protected] on 27 Apr 2013 at 2:56