States tests and rename

[harshiltewari2004]

Resolves #8761

Changes

• Renamed States.getDiff() → States.takeDiff() to reflect that it mutates state (clears #modified after returning), per discussion in [p5.js 2.0+ Bug Report]: Missing unit tests for src/core/States.js #8761 with @davepagurek.
• Updated the one call site in src/core/p5.Renderer.js to use the new name.
• Added a new test file test/unit/core/States.js with 9 tests covering the public API: constructor, setValue, getModified, takeDiff, applyDiff, plus a push/pop integration test.

Notes on test results

Local npm test shows all 9 new States tests passing. There are 4 pre-existing unrelated timeout failures in visual regression tests (test/unit/visual/cases/noise.js, test/unit/visual/cases/shape_modes.js) that don't reference any of the code I changed — they appear flaky on my machine. Running the new test file in isolation (npx vitest run test/unit/core/States.js) shows clean 9/9 pass.

PR Checklist

• npm run lint passes
• Inline reference is included / updated
• Unit tests are included / updated

[p5-bot]

Continuous Release

CDN link

• https://raw.esm.sh/pr/p5@5043048/lib/p5.min.js

Published Packages

• https://pkg.pr.new/p5@5043048

Commit hash: b54e540

Previous deployments

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This is an automated message.

[davepagurek]

Looks great, thanks!

[davepagurek]

@all-contributors please add @harshiltewari2004 for code

[harshiltewari2004]

Thank you so much @davepagurek !