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xwayland/present: Redirect surface window as needed for page flips

It's needed when the surface window is a depth 24 descendant of a depth 32 toplevel window.

xwl_source_validate ensures the toplevel window pixmap has valid contents when a client reads from it, or when the window hierarchy / geometry changes. It's never called in the normal fullscreen application case, so there's no GPU copy overhead with that.

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