Due to Wayland, shared code cannot rely on cursor positioning being
supported by the underlying platform.
This implicitly fixes#617 as it moves cursor centering into
_glfwPlatformSetCursorMode, thus separating it from the stale value of
_glfw.cursorWindow.
Fixes#617.
This implements support for the 'DISABLED' cursor mode, which
effectively means locking the pointer to the surface. The cursor is also
explicitly hidden.
This adds two new build dependencies: wayland-scanner and
wayland-protocols.
Closes#708.
Although very unlikely, the wl_compositor version might not support
wl_surface.set_buffer_scale while the wl_output emits a wl_output.scale
that is larger than 1. So for correctness, bail on changing the buffer
scale if we won't be able to set it later.
Windows now keep track of the monitors they are on, so we can calculate
the best scaling factor for them, by using the maximum of each of the
monitors.
The compositor scales down the buffer automatically when it is on a
lower density monitor, instead of the previous way where it was scaling
up the buffer on higher density monitors, which makes the application
look much better on those ones.
