Bug 265673 – [scroll-animations] WPT test scroll-animations/css/view-timeline-shorthand.html has incorrect contraction tests

• Status: RESOLVED
• Resolution: FIXED
• Component: Animations

[Antoine Quint]

There are three tests at the end of the WPT test scroll-animations/css/view-timeline-shorthand.html:

```
test_shorthand_contraction('view-timeline', {
  'view-timeline-name': '--a, --b, --c',
  'view-timeline-axis': 'inline, inline',
  'view-timeline-inset': 'auto, auto',
}, '');

test_shorthand_contraction('view-timeline', {
  'view-timeline-name': '--a, --b',
  'view-timeline-axis': 'inline, inline, inline',
  'view-timeline-inset': 'auto, auto, auto',
}, '');

test_shorthand_contraction('view-timeline', {
  'view-timeline-name': '--a, --b',
  'view-timeline-axis': 'inline, inline',
  'view-timeline-inset': 'auto, auto, auto',
}, '');
```

These are wrong in the same way that the equivalent `scroll-timeline` shorthand tests were and which got fixed in 271190@main after discussion at https://github.com/web-platform-tests/wpt/issues/43336. Indeed, the computed value should trim the longhands to match the length of `view-timeline-name`.

[Antoine Quint]

Pull request: https://github.com/WebKit/WebKit/pull/21166

[Antoine Quint]

Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/43478

[EWS]

Committed 271397@main (3ec49d8dfd30): <https://commits.webkit.org/271397@main>

Reviewed commits have been landed. Closing PR #21166 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/119041818>