Added Wayland plugin to Qt backend on Linux

[asmorkalov]

No description provided.

[asmorkalov]

Ubuntu 22.04 with KDE and Wayland session:

qt.qpa.wayland: Failed to load client buffer integration: "wayland-egl"
qt.qpa.wayland: Available client buffer integrations: ()
qt.qpa.wayland: No shell integration named "xdg-shell" found
qt.qpa.wayland: No shell integration named "xdg-shell-v6" found
qt.qpa.wayland: No shell integration named "wl-shell" found
qt.qpa.wayland: No shell integration named "ivi-shell" found
qt.qpa.wayland: Loading shell integration failed.
qt.qpa.wayland: Attempted to load the following shells ("xdg-shell", "xdg-shell-v6", "wl-shell", "ivi-shell")

[mahyarmirrashed]

What's the deal with the failing test for 3.8? From the error messages, it seemed to be something about being able to clone. I hope that it is nothing specific to that version of Python because that is what I am currently running in my Conda environment.

[Kuba314]

Would it be possible to resolve this?