Removing window shape region

[Andreas Falkenhahn]

Hi,

is it possible to remove a shape region that was installed using
XFixesSetWindowShapeRegion()? I'm not interested in simply setting the
shape region to an opaque region matching the window's bounds. I want to
remove the shape region completely. I.e. after removal, the window should
act as if XFixesSetWindowShapeRegion() had never been called on it. Is
that possible? I tried passing "None" as region, but that doesn't seem to
work.

Thanks for any help,

Andreas