fix(bubble-list): 修复列表长度变为1的时候, 报undefined的问题. close #438

[L1yp]

close #438

Summary by CodeRabbit

• Bug Fixes
  • Improved auto-scroll behavior to only activate when lists contain multiple items, preventing unnecessary scrolling when lists are empty or contain a single item.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The watcher on props.list.length in the BubbleList component is now conditioned to trigger only when the list length exceeds 1, preventing auto-scroll invocation for lists with 0 or 1 items. This avoids an error in the autoScroll() function when attempting to access the second-to-last element of a single-item list.

Changes

Cohort / File(s)	Summary
BubbleList watcher fix packages/core/src/components/BubbleList/index.vue	Changed list-length watcher condition from > 0 to > 1 to prevent auto-scroll errors when list contains only one item

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• feat(BubbleList): add autoScroll attrbuite #339 — Adds an autoScroll prop to BubbleList and guards auto-scroll behavior, addressing similar scroll control concerns in the same component.
• docs(BubbleList): modify props desc in BubbleList component #330 — Modifies BubbleList's auto-scroll and tolerance logic, also affecting the scroll behavior referenced in this fix.

Suggested reviewers

• HeJiaYue520
• WengJianFei

Poem

🐰 A bubble list once tripped on its feet,
When single items caused scroll to repeat,
Now the watcher stands guard, wise and keen,
Only scrolling where two bubbles are seen! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the fix: addressing undefined error when BubbleList length becomes 1, which matches the watcher change preventing autoScroll calls when list has fewer than 2 items.
Linked Issues check	✅ Passed	The PR correctly implements the required fix by changing the watcher condition from length > 0 to length > 1, preventing autoScroll execution when insufficient items exist to safely access the second-last item.
Out of Scope Changes check	✅ Passed	The change is narrowly scoped: only the watcher condition in BubbleList is modified to fix the identified issue, with no unrelated alterations.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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