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Well, there are a lot going on in this commit. The app now render
things like background grid or other content based on the visible
area only, not the whole canvas.

The second thing is some early PoC for a reusable character layout,
previously, we use grid_text to render the whole data buffer to the
screen, it requires a lot of text layout update, rebuild, clone the
screen buffer into a new string on EVERY FUCKING MOUSE MOVE! With the
new approach, all box drawing characters which will be rendered on the
screen will be pre-built and never be built again during runtime.

More on the next commit.