Wayland XDG Shell Protocol, version 1.18

The XDG-Shell protocol is an extended way to manage surfaces under Wayland compositors.

Used in the Qt Wayland Compositor, and the Qt Wayland platform plugin.

The sources can be found in qt5/qtwayland/src/3rdparty/protocol/xdg-shell-unstable-v5.xml, qt5/qtwayland/src/3rdparty/protocol/xdg-shell-unstable-v6.xml, qt5/qtwayland/src/3rdparty/protocol/xdg-shell.xml, qt5/qtwayland/src/compositor/extensions/pregenerated/3rdparty/qwayland-server-xdg-shell-unstable-v5.cpp, qt5/qtwayland/src/compositor/extensions/pregenerated/3rdparty/qwayland-server-xdg-shell-unstable-v5_p.h, qt5/qtwayland/src/compositor/extensions/pregenerated/3rdparty/wayland-xdg-shell-unstable-v5-protocol.c, qt5/qtwayland/src/compositor/extensions/pregenerated/3rdparty/wayland-xdg-shell-unstable-v5-server-protocol_p.h, qt5/qtwayland/src/pluginr