The source project of this merge request has been removed.
Add a mention of libdecor to xdg-decoration
Applications migrating from X11 to Wayland might make the assumption that SSDs are always available (or not put in the effort to support CSDs at all; for example, SDL2 didn't support CSDs on Wayland until it added libdecor support), and as such, they would be broken on compositors that only support client-side decorations.
This adds a mention of libdecor to the xdg-decoration protocol description, so that applications can easily know of solutions to use when they might not want to put in the effort to support client-side decorations.