[PATCH] Webcontent scrolling

[William Viana]

The WebContent widget was not scrolling well. I took a look and by
adding a call to update() in some of the events it at least works
better.  update() forces a call to paint which is probably not the
best thing to do after every mousePressEvent but I couldn't find a
better way. It works well when you move the scroll bar but not really
well when you click and press the scroll bar's arrows (no idea why).
The update() call on loadFinished makes the widget to display the
content faster.

Please review.
-- 
    -William-
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