[Qt-qml] About BorderImage size

[罗军]

Hi, everyone

    I have a picture, width is 24 and height is 42
    
Item {
    BorderImage {
        x: 0;
        width: 109; height: 42
        border { left: 8; top: 0; right: 8; bottom: 0 }
        verticalTileMode: BorderImage.Round // BorderImage.Repeat,  BorderImage.Stretch

        source: "xxx.png"
    }
}

Its width is shorter than 109, about 8 pixel.
When I change width is 120(24*3+16=120), it's ok.
Why ?

Best regards.
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