Mutter is getting rid of it and it is deprecated. https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2207
Thanks for the heads-up.
For reference, here's the merge request for such update in GTK: https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/35
WebKitGTK does not use the xdg-shell protocol at all: it provides a widget for GTK, and GTK is ultimately responsible to decide how to interact with the compositor. The WPE port only uses the xdg-shell (in particular zxdg-shell-v6) in the MiniBrowser, which is intended only for testing. Or does the reporter of the issue mean something else?
(In reply to Adrian Perez from comment #3) > The WPE port only uses the xdg-shell (in particular zxdg-shell-v6) in the > MiniBrowser, which is intended only for testing. No, that's it exactly. We just need to fix WPE MiniBrowser.