[PATCH]KonqIconViewWidget speedup

[Enrico Ros]

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Hi, I'm posting the patch here because I'm not so confident with 
KonqIconViewWidget but I spotted a performance problem.

When the mouse is moved over this widget (the Desktop itself for example!) a 
check is performed on each movement and that check is so slow.

I'm also thinking at binary compatibility due to a new virtual function added 
to konq_sound's classes. Are problems raised by this patch?

The following tests are performed @ 300 MHz, but you can notice wasted cpu 
cycles even @ GHz! The values are the % of the used cpu for that operation.Mouse movement over a blank widget: 28%Mouse movement over a KIView widget WITHOUT patch: 67%Mouse movement over a KIView widget WITH patch: 37%---------KIView relative load WITH patch: 9%KIView relative load WITHOUT patch: 39%Relative speed gain in KIView with patch applied: ~4x

This is because the QApplication::widgetAt( .. ) static call is very 
expensive. Fortunately this check is needed only when the sound is playing so 
I added a simple check.

Bye
--Enrico
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