Drawer flickers on release when closing

A touch device is needed to reproduce this.

Steps:

• open the drawer
• drag the drawer half-way towards the window edge
• release

Expected:

• drawer animates smoothly to the closed position

Actual:

• drawer flickers at fully opened position for one frame, and then continues animating from where it was previously

import QtQuick 2.7
import QtQuick.Window 2.2
import QtQuick.Layouts 1.3
import QtQuick.Controls 2.0

ApplicationWindow {
    id: window
    width: 360
    height: 360
    visible: true

    Drawer {
        id: drawer
        width: window.width * 0.8
        height: window.height
    }

    Button {
        text: "Open"
        onClicked: drawer.open()
        anchors.centerIn: parent
    }
}

The problem is that QQuickWindow::translateTouchToMouse() sends a weird mouse move event at coordinates INF,INF to clear hover (https://codereview.qt-project.org/#/c/142532/). Drawer should probably ignore this extra move event instead of calculating its position based on the INF,INF coordinates.