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The purpose of this function isn't exactly clear, but from the way it's used it would appear to be a function that appropriately scales a frame for full-screen views, such as the world map frame, to fit on the screen maximally depending on the aspect ratio. Why this wasn't implemented in lua isn't entirely clear, though it may require information about the screen geometry which isn't exposed through the standard UI.
- The frame to manipulate.
- SetupFullscreenScale replaced SetupWorldMapScale in 1.12.