I tested running tlclient under Gnome and Wayland on my Fedora 22. Everything seems to work well, except for keyboard grab. I.e. things like alt-tab do not work properly in full screen. This may be a general wayland problem though. See this part of the wayland documentation: http://wayland.freedesktop.org/docs/html/ch04.html#sect-Protocol-Input I doubt they can keep this model though as any remote access or virtualisation product requires keyboard grab at one point or another. We'll have to keep an eye on things and see how it develops.
Upstream work: https://bugzilla.redhat.com/show_bug.cgi?id=1285770
Still a problem on Fedora 25, maybe we should try to detect and disable the "Send system keys" option when running client on Xwayland, at least add platform specific note.
It's not obvious how to detect wayland as I can notice that a wayland display socket is created even if I log in to a X11 session. However a connect to this socket fails. The socket is available as ${XDG_RUNTIME_DIR}/${WAYLAND_DISPLAY} Perhaps we can detect Xwayland somehow?
Mechanisms are getting finalised. However we need to do some window manager interaction. See this comment upstream: https://bugzilla.gnome.org/show_bug.cgi?id=783342#c124
This now works on Fedora Rawhide (for upstream vncviewer). Note though that the function is disabled by default, and you have to muck around in dconf to enable it. :/
The setting you need to change is "org.gnome.mutter.wayland.xwayland-allow-grabs". However upstream has now dropped that requirement from the upcoming version: https://gitlab.gnome.org/GNOME/mutter/merge_requests/572/diffs So it should mean that GNOME 3.34 is easier to get working.
The version of GNOME supporting grabs in Wayland (3.28) has now also trickled out to distributions. Fedora has it, as does RHEL 7 and 8.
Fixed the main part upstream, so we'll get this sorted out in the next vendor drop: https://github.com/TigerVNC/tigervnc/commit/da10343f32b9d3f9dcd79254627d010152ecf91e Unfortunately I discovered that upstream had forgotten about XGrabPointer(), so it still doesn't fully work: https://gitlab.gnome.org/GNOME/mutter/issues/642 It gets a lot better with that first fix though.
Also note that it is possible to get grabs working without modifying the ThinLinc client by explicitly adding "thinlinc-client" to the dconf setting "org.gnome.mutter.wayland.xwayland-grab-access-rules".
Verified that the problem exists when running the 4.11.0 client on Wayland. Things work great for me with the new code, I can't even reproduce the XGrabPointer issue. Win+Right-click works well with "Send system keys" enabled in fullscreen. $ gnome-shell --version GNOME Shell 3.34.3
Release notes look good.
