Setting the focus of a FocusScope to false doesn't remove active focus from child items.

import QtQuick 1.0

MouseArea {
    width: 300; height: 300

    onClicked: scope.focus = false

    Rectangle {
        anchors.centerIn: parent
        width: 200; height: input.implicitHeight + 4
        border.width: 1
        color: input.activeFocus ? "white" : "grey"

        FocusScope {
            id: scope
            anchors.fill: parent
            TextInput {
                id: input
                anchors { fill: parent; margins: 2 }
                focus: true
            }
        }
    }
}