update_pixels example is not working

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Description

The update_pixels example, which demonstrates using graphics_update_region for rendering squares, is not working properly.

This is how it renders right now ( https://github.com/processing/libprocessing/commit/13e7e0fb61cad27bf2c7d2afdff57f5e64909076 ):

Tested on Windows 11, on Rust 1.92.0. Minimum reproductions is just running cargo run --example update_pixels.

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