GLX warnings about openhantek6022

[Ho-Ro]

Please provide more info about your system:

• Video HW, GLX version, QT version
• What does it say if started with OpenHantek --useGLES?

Otherwise a shot in the dark:
https://stackoverflow.com/questions/53768408/qt3d-qt-glx-qglx-findconfig-failed-to-finding-matching-fbconfig-warning
You could try to comment out this line:

OpenHantek6022/openhantek/src/glscope.cpp

Line 43 in 1f36495

format.setSamples(4); // Antia-Aliasing, Multisampling

-> // format.setSamples(4); // Antia-Aliasing, Multisampling

[Vascom]

With OpenHantek --useGLES same thing.

Graphics:  Device-1: Intel Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics vendor: Hewlett-Packard driver: i915 
           v: kernel bus ID: 00:02.0 chip ID: 8086:0412 
           Display: x11 server: Fedora Project X.org 1.20.4 driver: modesetting unloaded: fbdev,vesa compositor: kwin_x11 
           resolution: 1920x1200~60Hz 
           OpenGL: renderer: Mesa DRI Intel Haswell Desktop v: 4.5 Mesa 19.0.3 compat-v: 3.0 direct render: Yes

libglvnd-glx-1.1.0-4.gitf92208b.fc30.x86_64
Qt 5.12.1

After comment this line I not see this warning.

[Ho-Ro]

From what I saw by googling quickly this regression starts with update Qt 5.11 -> Qt 5.12.
I never deep-dived into all this GL code of OpenHantek, so please check if the hack from above gives some screen artifacts because the setting is intended for anti-aliasing purpose.
Otherwise we can call it a fix.

[Vascom]

Yes it is antialiasing.
And if it is Qt regression than better don't change this.
See screenshots without and with this feature

[Ho-Ro]

warnings go away with cleanup 770b8f7