[Qt Wayland] Cuda existing window is not focused when you open text file

[pintassilgo]

1. Wayland session.
2. Launch Cuda Qt (both official Qt5 and Flatpak Qt6 are affected).
3. Minimize Cuda and open a text file externally. For instance, by doubleclicking the file from desktop or from your file manager, or by terminal /path/to/cudatext "/path/to/textfile.txt".

Expected:

The already open Cuda window should jump to the front, displaying the file you opened.

Current:

The file opens, but Cuda window is not focused, you need to manually switch to it to read/edit.

Gtk is not affected.

I use KDE Plasma, but hopefully any DE running Wayland session is affected when you run Qt Cuda.

Currently, I run Cuda with QT_QPA_PLATFORM=xcb set to avoid this issue. By doing this, I'm launching Cuda as xwayland window instead of native Wayland, so I shouldn't do it. And Cuda xwayland has its own bugs like #5132.

[pintassilgo]

Is this one Lazarus bug too?

[Alexey-T]

I guess yes, I will try to make repro-demo later.

[pintassilgo]

Thanks.. Offtopic: did you forget to release 1.214.5.0 here on GitHub? I'm notified of Cuda updates though GitHub, but I happened to go to SourceForge then I realized I was using an outdated version.

[Alexey-T]

I made the release on GH now, thanks.

[Alexey-T]

Lazarus bugreport:
https://gitlab.com/freepascal.org/lazarus/lazarus/-/issues/40956

[Nyunyun]

Just commenting to tell that this happened to me on Qt6, too.
Qt5 and GTK2 don't have this issue on my system.
GTK2 runs in xwayland and has a loading symbol for way after opening a file or the app, though, so I opted for Qt5.

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