Bringup on Wayland

[quozl]

Sugar desktop does not start on Wayland when tested with Fedora 27.

Workaround is to avoid Wayland by using an Xorg fallback configuration.

• find out exactly what goes wrong when started under Wayland,
• fix it, and port any necessary libraries such as our X session manager in sugar-toolkit-gtk3.

Our plans in 2013 were to wait for the necessary libraries to become available for Wayland, and these libraries seem to be available now.

[quozl]

One of the things that goes wrong is a blank display and return to greeter or previous shell. The logs show libwnck is designed to work in X11 only, no valid display found, with consequence that screen in src/jarabe/main.py is None.

There will be other things that go wrong, but these may only be found one at a time.

[aperezbios]

Possibly relevant: mrichar1/clipster#53

[quozl]

#951 is a set of changes used to get Sugar to start under Wayland. GTK+ now renders to Wayland if it is present. Activities can also be run from GNOME Terminal using sugar-activity3 and continue to work after the Xwayland process is given a SIGSTOP signal, which confirms the Toolkit is rendering using Wayland and well on the way to being independent of X11. Lots to do.