Wayland clipboard sync (xvfb -> Wayland)

[taoky]

Note: clipsync.py is generated by LLM.

Closes: #218.

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flatpak install --user https://dl.flathub.org/build-repo/233002/com.qq.QQ.flatpakref

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✅ Test build succeeded. To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/233023/com.qq.QQ.flatpakref

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[StarsEnd33A2D17]

A window titled “wl-clipboard” may appear unexpectedly, which can cause focus issues (see bugaevc/wl-clipboard#268).

for example, in niri v25.11, you need to add the following window-rule as a workaround:
It turns out that copying is not triggered when the window has no focus, so this workaround doesn’t work :(

window-rule {
    match title="wl-clipboard"
    open-focused false
    open-floating true
}

[Integral-Tech]

Unfortunately, QQ only supports x-special/gnome-copied-files MIME type for copied files:

proc = CompletedProcess(args=['xclip', '-selection', 'clipboard', '-out', '-target', 'TARGETS'], returncode=0, stdout='QQ_Unicode_RichEdit_Format\nx-special/gnome-copied-files\n', stderr='')

[arenekosreal]

Nesting xvfb, clipsync and zypak-wrapper together just for fixing QQ's misbehaving on Wayland, what a horrible thing I think. As for my personal opinion, I prefer doing what we have done in https://github.com/flathub/com.qq.QQ/blob/master/patch/rename.cpp, we inject something in QQ's native code to workaround this problem. But I do not do any research about it, hope we can find correct hook point if we have to do so.

If we need to inject Electron part, there has already been a tool: https://github.com/ShellWen/v8_killer

Using xvfb increases memory usage for about 40MB. It is acceptable here compared to QQ itself's memory usage.

P.S.: If we have no choice, current implementation is also acceptable.