Fix line numbers when soft wrap is on

[chasehuh]

Summary

• Soft-wrapped lines were getting mismatched gutter numbers because each gutter cell was fixed to one visual row
• Measure each hard line's visual row count via a mirror element and stretch gutter cells to match
• Wrap off keeps the previous 1:1 gutter behavior; ResizeObserver refreshes on width changes

Test plan

• Open localhost with wrap enabled and a long Korean line — only one number for that hard line
• Soft-wrap continuations have no new line number beside them
• Toggle Settings → Editor → No wrap — numbers return to 1:1
• Resize the editor width — gutter heights update
• Scroll the textarea — gutter stays aligned

Made with Cursor

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
memo	Ready	Preview, Comment	Jul 14, 2026 6:32am