QOpenGLWidget GPU memory leak

Creating QOpenGLWidget on stack or allocating dynamically will not free resources when deleted.

I created one instance of QOpenGLWidget for every newly opened tab in TabWidget.

After destroying them, memory in VRAM was not freed. It takes only a few tabs to get to 2GB of VRAM used without any option to free it. 

I tried delete on context as well as on widget itself, deleteLater etc.

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(); 
} 

In TaskManager (and Visual Studio Memory Usage) the memory used will be only higher with minimal deallocations happening.