fix SVG preserveAspectRatio="none" handling for <symbol>/<use>

[Danyccsf]

Resolves #9257

Changes:

• Respect preserveAspectRatio="none" when a <use> element references a <symbol> with a viewBox.
• Apply independent X and Y scaling instead of the default uniform xMidYMid meet scaling in this case.
• Account for non-zero viewBox origins when applying the transform.
• Preserve the existing default xMidYMid meet behavior for other cases.
• Add regression tests for non-uniform scaling and a non-zero viewBox origin.

Screenshots of the change:
N/A — this change is covered by SVG importer unit tests.

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@691e886/lib/p5.min.js

Published Packages

• https://pkg.pr.new/p5@691e886

Commit hash: 691e886

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[davepagurek]

This is looking good! Do you think we could add some visual tests so it's easier to verify the output?

I also was looking at https://developer.mozilla.org/en-US/docs/Web/SVG/Reference/Attribute/preserveAspectRatio to see what other options there are than none. Do you have a sense of what it might take to fully cover this attribute and whether that's worth adding?

[Danyccsf]

This is looking good! Do you think we could add some visual tests so it's easier to verify the output?

I also was looking at https://developer.mozilla.org/en-US/docs/Web/SVG/Reference/Attribute/preserveAspectRatio to see what other options there are than none. Do you have a sense of what it might take to fully cover this attribute and whether that's worth adding?

Thanks, Dave! I appreciate the feedback.

I'll look into the existing visual testing setup and add appropriate visual coverage for this case.

I'll also review the other preserveAspectRatio options and assess the scope of supporting them, so we can decide whether they belong in this PR or would be better handled separately.

I'll follow up with my findings!