tests: cover the wayland window surface rendering#156
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Adds a rendering test for the Wayland shared-memory window surface. Unlike the offscreen rendering test, this draws into a real window content view backed by the wl_shm surface and reads the pixels back: a solid fill paints the window and filling the left half leaves the right half alone, which exercises the shm surface cairo drawing and the GSReadRect read-back through the on-window path. It builds only for the wayland+cairo backend and skips when no compositor can be reached, so it is inert on the other backends and in CI.
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Adds a rendering test for the Wayland shared-memory window surface.
Unlike the offscreen rendering test, this draws into a real window content view
backed by the wl_shm surface and reads the pixels back: a solid fill paints the
window and filling the left half leaves the right half alone, which exercises
the shm surface cairo drawing and the GSReadRect read-back through the on-window
path.
It builds only for the wayland+cairo backend and skips when no compositor can be
reached, so it is inert on the other backends and in CI.