UI bugs out when using qt5ct/qt6ct

[djsigmann]

When the environment variable QT_QPA_PLATFORMTHEME is set to either qt5ct or qt6ct, the application has some sort of weird UI behaviour, where the dialogs to tune scope functionality are stretched out and cannot be minimized..
This occurs both when connecting to a device or using the demo mode.

Setting QT_QPA_PLATFORMTHEME to an empty value does allow the application to run and function properly, albeit, without themes being applied.

This problem suddenly occurred the other day, checking my package manager logs, neither OpenHantek6022 nor qt6ct were updated in the time between the last successful invocation of the program and the first time this bug occurred, nor were any QT-related settings changed.

Setup:

• OpenHantek version: Latest commit
• OS: Arch Linux
• Screen resolution, 1920x1080
• Video hardware: NVIDIA GeForce GTX 1060 6GB
• OpenGL version: 4.6.0 NVIDIA 575.64
• Qt version: 5.15.17+kde+r123-1
• C++ compiler version: gcc 15.1.1 20250425
• Device: Hantek 6022BE

[Ho-Ro]

Please check if the latest devdrop that uses Qt6 instead of Qt5 fixes your issues.

[djsigmann]

@Ho-Ro I tried the lastest commit (68439b7) and the same behaviour occurs. I'm starting to suspect this might be a downstream packaging issue.