QOpenGLWidget GPU memory leak

[ligazetom]

Hello,

I have QTabWidget setup so everytime I push button, it creates new tab with QOpenGLWidget inside. Nothing else.

First tab, memory usage jumps from 12MB to 336 MB then after a while goes down to 180 MB. Each new tab adds around 30 MB.

If I click four times I will have four tabs, each with its own QOpenGLWidget instance taking up around 270MB.

Now if I destroy ALL tabs memory goes UP! to 414MB and stays there. This is ALL VRAM.

First of all, even if I was not deleting QOpenGLWidgets, I see no reason for the memory usage to go up.
Second, I DO delete them.

To reproduce: Create project with MainWindow and TabWidget inside and some trigger event (PushButton or action etc.)
And Implement two methods.

void Project::on_actionOpen_triggered()
{
	ui->tabWidget->addTab(new QOpenGLWidget, "Tab");
}

void Project::on_tabWidget_tabCloseRequested(int tabId)
{
	QOpenGLWidget *vw = static_cast<QOpenGLWidget*>(ui->tabWidget->widget(tabId));
	vw->deleteLater();
}

That's it.

Windows 10 Pro
QT 5.14.1
Visual Studio 2017

I can see memory usage in VS Profiling tools as well as in Task Manager.

[ligazetom]

TabWidget::Clear() does not emit close request....