Doesn't work Drag&Drop in fullscreen mode with Qt::WA_NativeWindow flag

#include <QApplication>
#include <QMainWindow>
#include <QWidget>
#include <QTextEdit>
#include <QHBoxLayout>
#include <QCheckBox>
#include <QDebug>

class Widget : public QTextEdit
{
public:
	Widget(QWidget* parent = nullptr) : QTextEdit(parent) {
		setAcceptDrops(true);
		setAttribute(Qt::WA_NativeWindow);
		setAttribute(Qt::WA_AcceptTouchEvents);
		setAutoFillBackground(false);
		setUpdatesEnabled(true);
		setFocusPolicy(Qt::StrongFocus);
		setMouseTracking(true);
		setTabletTracking(true);
	}
	void turnOnFullscreen()
	{
		if (!windowState().testFlag(Qt::WindowFullScreen))
		{
			setParent(nullptr);
			show();
			showFullScreen();
			activateWindow();
			raise();
			setFocus();
		}
	}
};

class MMainWindow : public QMainWindow
{
public:
	MMainWindow(QWidget* parent = nullptr) : QMainWindow(parent)
	{
		QHBoxLayout* layout = new QHBoxLayout(this);
		Widget* textEdit = new Widget(this);
		QCheckBox* checkBox = new QCheckBox("Fullscreen mode", this);
		QTextEdit* dragText = new QTextEdit("Text for drag and drop", this);
		dragText->setReadOnly(true);

		connect(checkBox, &QCheckBox::stateChanged, [=](int state){
			if(state == Qt::Checked)
			{
				textEdit->turnOnFullscreen();
			}
		});

		layout->addWidget(textEdit);
		layout->addWidget(dragText);
		layout->addWidget(checkBox);

		QWidget* window = new QWidget(this);
		window->setLayout(layout);
		setCentralWidget(window);
	}
};

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	MMainWindow w;
	w.show();
	return a.exec();
}