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When tiling window managers resize a non-resizable window they're violating ICCCM. Not some hippie-community standard like EWMH, but ICCCM, which is about as old and sacred as the constitution. If they want to force a window to be a size it wasn't designed for, at least they could have the decency to reparent the client window into a bigger containing window of whatever size they think it should be. But apparently ICCCM compliance is too much to ask. Anyway, all that just to say that it's really not our fault when we get an enter event with coordinates outside the valid output region. But we'll clip it anyway and work around mis-behaving tiling WMs.
Weston Weston is the reference implementation of a Wayland compositor, and a useful compositor in its own right. Weston has various backends that lets it run on Linux kernel modesetting and evdev input as well as under X11. Weston ships with a few example clients, from simple clients that demonstrate certain aspects of the protocol to more complete clients and a simplistic toolkit. There is also a quite capable terminal emulator (weston-terminal) and an toy/example desktop shell. Finally, weston also provides integration with the Xorg server and can pull X clients into the Wayland desktop and act as a X window manager. Refer to http://wayland.freedesktop.org/building.html for buiding weston and its dependencies.