Andreas Kling 96f8fcdcba LibGUI: Add a WindowBackingStore class ...

Instead of storing the back/front buffers of a GUI::Window as just
Gfx::Bitmap, wrap them in a WindowBackingStore class.

This will allow us to add more information alongside the bitmaps while
keeping the back/front swapping logic simple.

2021-01-15 10:54:19 +01:00

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