Flickering on resize

[hombit]

All widgets change their size rapidly while application window is being resized.

We found that if scroll_zoom_area widget is switched of in main window than flickering disappear

[hombit]

The problem appears when OpenGLWidget is created in ScrollZoomArea constructor and only if OpenGLWidget's parent is this

[hombit]

Minimal example

#include <QApplication>
#include <QDockWidget>
#include <QLabel>
#include <QMainWindow>
#include <QOpenGLWidget>

int main(int argc, char** argv) {
	QApplication app(argc, argv);

	QMainWindow main_window;
	auto opengl_widget = new QOpenGLWidget(&main_window);
	main_window.setCentralWidget(opengl_widget);
	auto dock_widget = new QDockWidget("label", &main_window);
	main_window.addDockWidget(Qt::RightDockWidgetArea, dock_widget);

	main_window.show();

	return app.exec();
}

https://youtu.be/idnqK6uSfBA

[hombit]

Related bug in Qt: QTBUG-46634

[hombit]

We opened new issue in Qt bug tracker: QTBUG-77032