[Interest] QML innershadow

[Federico Buti]

Hi all,

last day we come up with a strage behaviour, or at least, what it seems a
strange behaviour to us. Following the documentation for InnerShadow QML
type it is stated that:

"Note: It is not supported to let the effect include itself, for instance
by setting source to the effect's parent."

However, the only way to obtain an homogenous internal shadow such as this
one <http://i.stack.imgur.com/XIbGq.png> (i.e. with offsets set to zero)
seems to break the documentation rule:

import QtQuick 2.0
import QtGraphicalEffects 1.0

Item {
    id: root
    width: 300
    height: 300

    Rectangle {
        id: myRectangle
        anchors.centerIn: parent
        width: 100
        height: 100
        color: "grey"
    }

    InnerShadow {
        anchors.fill: root
        cached: true
        horizontalOffset: 0
        verticalOffset: 0
        radius: 16
        samples: 32
        color: "#b0000000"
        smooth: true
        source: root      // <--- source include the effect!
    }
}

Is it intended behaviour or a bug? Is there another way to achieve an
overall shadow like the one in picture?

Thanks in advance,
F.
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