I am developing a Qt 6.5.3 C++ Widgets application running on an Ubuntu 22.04 touchscreen IPC. Wayland is disabled (strictly using an X11/Xorg session).

I cannot use the GPLv3-licensed qtvirtualkeyboard. I need to use Ubuntu’s native GNOME On-Screen Keyboard (OSK).

The Issue:
When a user taps inside a Qt QLineEdit, the default GNOME OSK behaves erratically—sometimes it pops up, but most of the time it doesn't trigger at all. This unreliability happens on a completely stock Ubuntu installation, I tried installing the "Improved OSK" GNOME extension and tested it and it's the same behaviour.

Currently, I am using a workaround where I launch the onboard keyboard utility via QProcess on focus events. While this works, it feels like an unnecessary external dependency hack.

Questions:

• Is there a way to make Qt 6 text widgets properly communicate focus changes to the GNOME/X11 accessibility layer so the native OSK triggers 100% of the time?

• What is the correct D-Bus interface/method under Ubuntu 22.04 to manually force the default GNOME keyboard to show/hide from C++?

Any insights on bridging this Qt-to-GNOME input gap would be greatly appreciated!