Virtual list feature

[desireddymohithreddy0925]

Description

This PR improves navigation for the VirtualList widget by introducing scrollToTop() and scrollToBottom() helper methods. When dealing with massive virtualized datasets (e.g. 100,000+ items), these methods allow developers to programmatically jump the viewport to the list bounds without having to manually calculate the offset math.

Related Issue

Closes #2252

Which package(s)?

@termuijs/widgets

Type of Change

• 🐛 Bug fix (type:bug)
• ✨ Feature (type:feature)
• 📝 Docs (type:docs)
• 🧪 Tests (type:testing)
• ♻️ Refactor (type:refactor)
• 🎨 Design / UX (type:design)
• ♿ Accessibility (type:accessibility)
• ⚡ Performance (type:performance)
• 🔧 DevOps / CI (type:devops)
• 🔒 Security (type:security)

Checklist

• ⭐ You starred the repo. The needs-star check blocks your merge otherwise.
• Tests pass locally: bun vitest run
• Build passes: bun run build
• Typecheck passes: bun run typecheck
• You read CONTRIBUTING.md.
• Your PR title follows type: short description.
• Widget state mutators call markDirty() (if your change affects rendering).
• No new any types without an inline comment explaining why.
• No unrelated refactors bundled into this PR.

GSSoC 2026 Participation

• You are a GSSoC 2026 contributor.
• Your GSSoC profile: https://gssoc.girlscript.org/profile/YOUR_PROFILE_ID_HERE

Screenshots / Recordings (UI changes)

Notes for the Reviewer

These methods wrap the existing scrollToIndex engine but use the correct alignment arguments (start and end) to guarantee that the first/last items snap correctly to the edges of the visible viewport, preventing overscan bleed.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: ff6dea7d-ed84-4f6e-a349-b168d75e4104

📥 Commits

Reviewing files that changed from the base of the PR and between 65d1f7e and 72aa9ef.

📒 Files selected for processing (1)

• packages/widgets/src/input/VirtualList.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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