Comment 5 for bug 597974

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su_v (suv-lp) wrote : Re: Masked objects in cairo-based exports with unexpected opaque region

Further tests show that the underlying cause seems to be that in cairo-based exports transparent bits of the mask are differently interpreted than by Inkscape:

In Inkscape, regions with minimum Alpha (zero alpha) are fully transparent.
In cairo-based exports, regions with minimum Alpha (zero alpha) are fully opaque.