[PATCH] control window opacity with your scrollwheel

[Christoph Richter]

Hi List!

I've hacked a little feature into xfwm4.2rc2: scrolling your mousewheel on a
window's border changes its opacity. Although I rarely make use of
translucent windows, I find it really convenient to change the window
transparency that way.

I hope you like that idea and it gets implemented into xfwm4 one day.

The patch also contains a tiny change to compositor.c: Translucent
windows tend to get a bit dark, due to their underlying shadow. I
changed the formula for the shadow's darkness to be proportional to
the window's opacity^2, which does look a bit better to my eyes.

Thanx for that wonderful DE!

        Toph
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