qml crashes when resize a Flow with anchors.fill: myParent

The following qml file with crash qml when the window is resized. This is due to the line "anchors.fill: f".

import Qt 4.7

Flow {
id: f

width: 250
height: 250

Text

{ text: "Hello World!"; }

Flow {
id: positioner
anchors.fill: f

spacing: 1

Repeater {
model: 20

Rectangle

{ width: 20 height: 20 color: "red" }

}
Text

{ text: "Hello World!"; }

}
Repeater {
model: 20

Rectangle

{ width: 20 height: 20 color: "red" }

}
}