[rekonq] simple tabpreview fade in

[Johannes Zellner]

Hi,

by finishing my coffee, I added a few lines to the tabpreview show.
It just fades the tabpreview in with windowOpacity property.

Fading out is not done, since there you usually want to see things behind 
asap.

The patch is rather simple, it does not really affect if you running without 
compositor, since it show then the preview immediately.

Good 0.5 release day!

Johannes
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