[Interest] Flicker in QMainWindowL::centralWidget on resize

Patrick Stinson patrickkidd at gmail.com
Sun Sep 22 22:16:12 CEST 2019

Hello there,

Just curious if anyone has seen this before I post a bug since at least 5.13.0 on Mac.

QMainWindow::centralWidget resizing is erratic when resizing QMainWindow. See two referenced + attached videos.

https://www.youtube.com/watch?v=0Qjy2wm6m9M&feature=youtu.be <https://www.youtube.com/watch?v=0Qjy2wm6m9M&feature=youtu.be>

Here is the minimal code for the above referenced youtube video:

def test_QMainWindow_resize():

    class Widget(QOpenGLWidget):
        def paintEvent(self, e):
            p = QPainter(self)

    app = QApplication(sys.argv)
    mw = QMainWindow()
    w = Widget()

As you can see, this becomes quite jarring with increased painting load:

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