Button stays hovered while pressed

• run with the universal style (to see clear hover effect)
• press the button
• move the cursor outside the button while keeping mouse pressed

expected: button is no longer hovered
actual: button stays hovered until the first move after release

import QtQuick 2.5
import QtQuick.Window 2.2
import QtQuick.Controls 2.0

ApplicationWindow {
    width: 300
    height: 300
    visible: true

    Button {
        text: "Button"
        anchors.centerIn: parent
    }
}