Request the windowing system to make
window partially transparent,
with opacity 0 being fully transparent and 1 fully opaque. (Values
of the opacity parameter are clamped to the [0,1] range.)
On X11, this works only on X screens with a compositing manager running.
For setting up per-pixel alpha, see
For making non-toplevel windows translucent, see
Derived by RGtkGen from GTK+ documentation
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