ScrollSpy textarea loses focus in Opera 11

Created by: codeaid

As the title says, the ScrollSpy textarea loses focus in Opera 11 each time the component reaches a nav target while dragging the scrollbar manually (not using the mouse wheel).

E.g. in the example on http://twitter.github.com/bootstrap/javascript.html#dropdown, if I start dragging the scroll bar of the textarea down with my mouse and reach the "@mdo" target, the textarea stops scrolling and the mouse cursor "detaches" from it.

It works in the latest Chrome and Firefox browsers as supposed though.

Tested with Opera 11.61 on Windows 7.