fix(html/formatter): preserve closing > before self-closing elements

[terror]

Summary

Fixes #9310.

When an inline element like <code> is immediately followed by a self-closing element like <br>, the
formatter's token borrowing pattern would steal the closing > from </code> to pass to the next
sibling. But self-closing elements (<br>, <img>, etc.) can't accept borrowed tokens in format_element_with_borrowing, so the > was silently dropped:

- <code>cubing.js</code<br>
+ <code>cubing.js</code><br>

The fix excludes self-closing elements from the borrowing pattern by only setting
next_is_adjacent_inline when the next element is an HtmlElement (which has opening/closing tags).

Test Plan

• Added inline-before-self-closing.html snapshot test covering <code>, <span>, <b>, and <a>
  followed by <br> and <img>.
• All existing HTML formatter tests pass (125 spec + 143 Prettier).

Docs

No docs changes needed.

[changeset-bot]

🦋 Changeset detected

Latest commit: ab2948e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 13 packages

Name	Type
@biomejs/biome	Patch
@biomejs/cli-win32-x64	Patch
@biomejs/cli-win32-arm64	Patch
@biomejs/cli-darwin-x64	Patch
@biomejs/cli-darwin-arm64	Patch
@biomejs/cli-linux-x64	Patch
@biomejs/cli-linux-arm64	Patch
@biomejs/cli-linux-x64-musl	Patch
@biomejs/cli-linux-arm64-musl	Patch
@biomejs/wasm-web	Patch
@biomejs/wasm-bundler	Patch
@biomejs/wasm-nodejs	Patch
@biomejs/backend-jsonrpc	Patch

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📥 Commits

Reviewing files that changed from the base of the PR and between eb58e58 and ab2948e.

⛔ Files ignored due to path filters (1)

• crates/biome_html_formatter/tests/specs/html/elements/inline/inline-before-self-closing.html.snap is excluded by !**/*.snap and included by **

📒 Files selected for processing (3)

• .changeset/sour-ducks-flash.md
• crates/biome_html_formatter/src/html/lists/element_list.rs
• crates/biome_html_formatter/tests/specs/html/elements/inline/inline-before-self-closing.html

🚧 Files skipped from review as they are similar to previous changes (2)

• crates/biome_html_formatter/src/html/lists/element_list.rs
• crates/biome_html_formatter/tests/specs/html/elements/inline/inline-before-self-closing.html

---

Walkthrough

Introduces a stricter borrowing check next_can_borrow for inline HTML elements: the previous next_is_adjacent_inline is replaced and borrowing of the prior element’s closing angle is allowed only when the next sibling is a non-text HtmlElement and both elements are externally whitespace-sensitive. Adjusts when borrowed_sibling_r_angle is stored and passes next_can_borrow into the element formatter to prevent mangling cases like <code>cubing.js</code><br>.

Possibly related PRs

• fix(format/html): preserve whitespace between a HtmlSingleTextExpression/HtmlElement and HtmlContent #8595 — Modifies the same crates/biome_html_formatter/src/html/lists/element_list.rs logic around inline adjacency and borrowing/whitespace handling.

Suggested reviewers

• dyc3
• ematipico

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main fix: preserving the closing > token when inline elements precede self-closing elements in HTML formatting.
Description check	✅ Passed	The description thoroughly explains the issue, root cause, and solution, directly addressing the formatting bug and including test coverage details.
Linked Issues check	✅ Passed	The pull request successfully addresses issue #9310 by preventing token borrowing from closing tags when the next element is self-closing, validated by the added snapshot test.
Out of Scope Changes check	✅ Passed	All changes are tightly scoped to fixing the HTML formatter's token-borrowing logic for inline-to-self-closing element transitions, with no unrelated modifications.

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