fix: Expose XList scrollHeight/scrollWidth getters

[Copilot]

Add missing scroll metrics to x-list so consumers can read container dimensions directly, aligning with existing scrollTop/scrollLeft behavior.

• XList API

  • Add scrollHeight and scrollWidth getters delegating to the internal scroll container.

• Test coverage

  • Extend get-scroll-container-info to assert both getters match reported container metrics.

• Release metadata

  • Add a patch changeset for @lynx-js/web-elements.

Example:

const list = document.querySelector('x-list') as any;
const { scrollHeight, scrollWidth } = list.getScrollContainerInfo();
console.log(list.scrollHeight === scrollHeight, list.scrollWidth === scrollWidth);

[!WARNING]

Original prompt

---

This section details on the original issue you should resolve

<filter_complete></filter_complete>

<issue_title>[Task] add scrollHeight getter for XList</issue_title>
<issue_description></issue_description>

<agent_instructions>1. See packages/web-platform/web-elements/src/elements/XList/XList.ts
2. like scrollTop, we should add a new getter for scrollHeight
3. add tests at packages/web-platform/web-elements/tests/web-elements.spec.ts</agent_instructions>

Comments on the Issue (you are @copilot in this section)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Task] add scrollHeight getter for XList</issue_title>
<issue_description></issue_description>

<agent_instructions>1. See packages/web-platform/web-elements/src/elements/XList/XList.ts
2. like scrollTop, we should add a new getter for scrollHeight
3. add tests at packages/web-platform/web-elements/tests/web-elements.spec.ts</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes [Task] add scrollHeight getter for XList #2155

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 4f7181d

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[coderabbitai]

Important

Review skipped

Bot user detected.

To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

• 🔍 Trigger a full review

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

📢 Thoughts on this report? Let us know!

[codspeed-hq]

CodSpeed Performance Report

Merging this PR will improve performance by 6.05%

_{Comparing copilot/add-scrollheight-getter-xlist (28c1862) with main (3cdf389)}

Summary

⚡ 2 improved benchmarks
✅ 61 untouched benchmarks
⏩ 3 skipped benchmarks¹

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	transform 1000 view elements	47.5 ms	45 ms	+5.51%
⚡	basic-performance-div-10000	484.1 ms	456.5 ms	+6.05%

Footnotes

1. 3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[PupilTong]

@copilot add a patch changeset

[Copilot]

@copilot add a patch changeset

Added a changeset for @lynx-js/web-elements in commit 28c1862.