QQuickWidget crash while reparenting

1. Run the demo app on Mac.
2. Click "File->Create QuickView"
3. In a newly created window click "Dock"
4. Rsize the window

Crash trace:
0 None None
1 QOpenGLFunctions::glUniformMatrix4fv(int, int, unsigned char, float const*) qopenglfunctions.h 2025 0x25a66b3
2 QOpenGLShaderProgram::setUniformValue(int, QMatrix4x4 const&) qopenglshaderprogram.cpp 2475 0x25a2c38
3 QSGOpaqueTextureMaterialShader::updateState(QSGMaterialShader::RenderState const&, QSGMaterial*, QSGMaterial*) qsgtexturematerial.cpp 106 0x120eba
4 QSGTextureMaterialShader::updateState(QSGMaterialShader::RenderState const&, QSGMaterial*, QSGMaterial*) qsgtexturematerial.cpp 370 0x12144a
5 QSGBatchRenderer::Renderer::renderMergedBatch(QSGBatchRenderer::Batch const*) qsgbatchrenderer.cpp 2068 0xefb3d
6 QSGBatchRenderer::Renderer::renderBatches() qsgbatchrenderer.cpp 2276 0xf197a
7 QSGBatchRenderer::Renderer::render() qsgbatchrenderer.cpp 2433 0xf3e8c
8 QSGRenderer::renderScene(QSGBindable const&) qsgrenderer.cpp 261 0x110288
9 QSGRenderContext::renderNextFrame(QSGRenderer*, unsigned int) qsgcontext.cpp 354 0x132084
10 QQuickWindowPrivate::renderSceneGraph(QSize const&) qquickwindow.cpp 386 0x1a2d44
11 QQuickRenderControl::render() QQuickRenderControl::render() 0x1b79f4
12 QQuickWidgetPrivate::renderSceneGraph() QQuickWidgetPrivate::renderSceneGraph() 0x1a112
13 QQuickWidget::timerEvent(QTimerEvent*) QQuickWidget::timerEvent(QTimerEvent*) 0x1c266
14 QObject::event(QEvent*) qobject.cpp 1233 0x19e3a0d
15 QWidget::event(QEvent*) qwidget.cpp 8371 0x2d0668b
16 QQuickWidget::event(QEvent*) QQuickWidget::event(QEvent*) 0x1cfd7
17 QApplicationPrivate::notify_helper(QObject*, QEvent*) qapplication.cpp 3522 0x2c9eed1
18 QApplication::notify(QObject*, QEvent*) qapplication.cpp 3487 0x2ca46fb
19 QCoreApplication::notifyInternal(QObject*, QEvent*) qcoreapplication.cpp 935 0x1990677
... <More>

The issue's related to QTBUG-40435. I applied change 0b0bb319578bb2e2eced3a80ce3876a4408b72a7, it solves the problem for QTBUG-40435, but a new crash appears now.

The issue should go to Laszlo Agocs.