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It is not possible to express a blit operation using paint nodes as of now. This is a requirement for GNOME Shell, e.g., to implement its blur effect. Add a new ClutterBlitNode node that takes two framebuffers as input, and blits the source framebuffer into the current one according to added rectangles. Because this paint node uses the rectangles in a different way compared to all the other nodes, add an auxiliary method to ensure all blit operations are valid. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1340>