Accordion calculates padding/height wrong with jQuery 1.9.0

Versions used:

The bug can be reproduced by using jQuery 1.9.0 and jQuery UI 1.9.2 or 1.10.0.

Bug description

When a panel is collapsed or expanded there is a slight "jump" of the height and it looks like it is because of the padding being calculated wrong.

Test case

I have created a test case here: http://jsfiddle.net/EmKay/amUhA/.

Click "Section 1" to collapse/expande the panel to see the bug.

If jQuery 1.8.3 is chosen instead of 1.9.0, there is no problem with the height/padding calculation.

Browsers

I can reproduce the bug in Firefox 18.0.1, Chrome 24.0.1312.56 m and IE 9.0.8112.16421.

OS

I am on a Windows 7 Pro with all updates installed.