[OU] Scrollbar click event bug on Opera

[su weisi]

I have found a opera bug of the click event and the div's scrollbar, look at
the example:

<div style="width:100px;overflow:auto">ajkoooooooooooooooooooooooo</div>
<div
style="width:300px;height:300px;position:absolute;background:blue;opacity:
0.3;top:0;" onclick="alert(123)"></div>

You can see two divs, one is below, one is on the top on another one, and
you click on the blue div, you can see the alert out, but when you click on
the scrollbar of the below div, you can move the scrollbar, and the blue
div's onclick event haven't been fired, tested on opera 9.23 and 9.5alpha1,
Is this a known bug? If known, how to fix it, or unknown, will it be fixed
in 9.5 next alpha? Thanks for reply.
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