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WindowServer: Add an Overlay class for flicker-free overlay rendering
An Overlay is similar to a transparent window, but has less overhead and does not get rendered within the window stack. Basically, the area that an Overlay occupies forces transparency rendering for any window underneath, which allows us to render them flicker-free. This also adds a new API that allows displaying the screen numbers, e.g. while the user configures the screen layout in DisplaySettings Because other things like drag&drop or the window-size label are not yet converted to use this new mechanism, they will be drawn over the screen-number currently.
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