Excluding certain programs from transparency

[houghi]

On Fri, Dec 04, 2009 at 10:15:18AM +0100, Olivier Fourdan wrote:
> xfwm4 support the property NET_WM_WINDOW_OPACITY_LOCKED (which has
> never made it to the freedesktop standard if I am not mistaken).
> 
> So if your media player sets this property, it will be excluded from
> transparency. Totally non-standard, I admit.

How would I do that? A search on google gave me a lot of code, but
unfortunatly not on how to do this.

houghi
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