Consider following code:

import Qt 4.7
Rectangle {
width: 360
height: 640
color: "red"
Rectangle {
y: 50
x: 0
gradient: Gradient {
GradientStop

{ position: 0 color: "#ffffff" }

GradientStop

{ position: 1 color: "#999999" }

}
width: 360
height: 600
}
}

Works OK on Windows.

On S^3 there is vertical red line al the left.

Setting value "x" to "-1" for internal rectangle hides vertical line, and no lines appears at right. Setting "x" to "-2" shows vertical red line at the right.

I've made test app that demonstrates all those cases, sources and screenshot is it attach.