Qt QML ListView sections visible when out of range

Question

I am having trouble bounding my ListView in QML.

I have taken the example provided by Qt (slightly modified but the exact code from the Qt example has the same issue), and tried to integrate it into my window.

As you can see in the image below, the ListView is supposed to be the size on the white Rectangle in the middle, yet the section headers are always visible, and the list elements are visible until completely out of the container Rectangle ("Guinea Pig" and "Tiger" are completely visible, although one would expect them to be only half visible)

I am sure the error is trivial, but i have tried all sorts of anchors and container types, but can't resolve this issue.

Here is the code :

import QtQuick 2.11
import QtQuick.Controls 2.4
import QtQuick.Window 2.11

Window {
    id: myWindowId
    flags: Qt.FramelessWindowHint
    visible: true
    x: 0
    y: 0
    width: 600
    height: 980
    color: "#333333"

    Rectangle {
        id: container
        x: 150
        y: 400
        width: 300
        height: 360

        ListModel {
            id: animalsModel
            ListElement { name: "Ant"; size: "Tiny" }
            ListElement { name: "Flea"; size: "Tiny" }
            ListElement { name: "Parrot"; size: "Small" }
            ListElement { name: "Guinea pig"; size: "Small" }
            ListElement { name: "Rat"; size: "Small" }
            ListElement { name: "Butterfly"; size: "Small" }
            ListElement { name: "Dog"; size: "Medium" }
            ListElement { name: "Cat"; size: "Medium" }
            ListElement { name: "Pony"; size: "Medium" }
            ListElement { name: "Koala"; size: "Medium" }
            ListElement { name: "Horse"; size: "Large" }
            ListElement { name: "Tiger"; size: "Large" }
            ListElement { name: "Giraffe"; size: "Large" }
            ListElement { name: "Elephant"; size: "Huge" }
            ListElement { name: "Whale"; size: "Huge" }
        }

        // The delegate for each section header
        Component {
            id: sectionHeading
            Rectangle {
                width: container.width
                height: childrenRect.height
                color: "lightsteelblue"

                Text {
                    text: section
                    font.bold: true
                    font.pixelSize: 20
                }
            }
        }

        ListView {
            id: view
            anchors.top: parent.top
            anchors.bottom: parent.bottom
            width: parent.width
            model: animalsModel
            delegate: Text { text: name; font.pixelSize: 18; color: "red" }

            section.property: "name"
            section.criteria: ViewSection.FirstCharacter
            section.delegate: sectionHeading
        }
    }
}

Please could someone tell me the correct way to display this ListView ?