Copy link failed on GNOME + Flatpak: arboard's Wayland path needs the
wlr/ext-data-control protocol, which Mutter does not implement, so it fell
back to X11 — reachable natively through XWayland, unreachable inside the
sandbox ("clipboard unavailable: X11 server connection timed out"). KWin
has the protocol, which is why the failure never reproduced on Plasma.
Replace it with a C++ shim (cxx/clipboard.cpp) that queues the write onto
the GUI thread and hands it to QClipboard: the base wl_data_device protocol
every compositor implements, no extra sandbox permission, and the offer
lives as long as the application (the #514 lifetime rule, without the
long-lived arboard instance). arboard is dropped from the crate.
Verified on Plasma/Wayland and on an Ubuntu GNOME/Wayland VM with DISPLAY
unset (the sandbox condition), where the copy now lands.
cc
vicrodh
6b81cfa84d