I see, thanks for the details! I’ll try that.
The issue is that the renderer and the message thread are not in sync. What you do may make the context render a new frame earlier than it would otherwise, making it “better”, but indeed you’ll always get some flickers.
I guess the real workaround is to force synchronous updates when the window gets resized as Jules suggests it here: AudioProcessorEditor drawing with OpenGLRenderer flickers on resizing - #2 by jules