Unexpected line breaks in numbered list output despite wide terminal

[Grrrolf]

Description

The CLI is inserting unexpected line breaks in numbered list items, splitting labels from their values even in a very wide terminal (245 characters).

Steps to Reproduce

1. Ask the agent to generate a numbered list with format: Label: value
2. Observe output in a wide terminal (245+ characters)

Expected Behavior

1. Product A: 498.6 min
2. Product B: 486.3 min
3. Product C: 283.5 min

Actual Behavior

1. Product A:
 498.6 min
2. Product B:
 486.3 min
3. Product C:
 283.5 min

Environment

• Terminal width: 245 characters
• CLI Version: 0.0.408
• OS: Darwin

Additional Context

• Line breaks occur inconsistently (some lines break, others don't)
• Not related to trailing spaces or Markdown formatting in source
• Switching to bullet points instead of numbered lists shows same issue
• Very short text should not trigger any wrapping logic

[teh-hippo]

Adding another datapoint that appears to be the same underlying wrapping bug, but with markdown tables (not just lists).

Environment

• GitHub Copilot CLI: 0.0.412-1
• OS: WSL2 Ubuntu on Windows Terminal
• Shells tested: zsh and PowerShell
• Terminal has visibly wide viewport, but rendered markdown behaves as if constrained to a much narrower internal width

Repro

Prompt used:

Render ONLY a markdown table with exactly 10 rows and 4 columns: Index, Category, Fact, LongNote.
Requirements: No prose before or after the table. Keep LongNote as one long sentence (25-40 words) with at least one URL-like token and one backticked token. Make each LongNote different. Do not use HTML.

Actual

• Table cell text wraps mid-row as if a narrow/fixed render width is being used.
• Wrapping occurs even when there is clearly additional horizontal space in the terminal.
• In one run, the CLI also ignored the “table only” constraint and emitted prose first.

Expected

• Markdown should wrap according to actual terminal/render width (or a clearly documented configured width), with consistent behavior across markdown structures (lists, tables, paragraphs).

[examon]

This appears to be resolved by the markdown rendering changes introduced in v1.0.10, which included fixes for list rendering with hard line breaks in alt-screen mode. We verified on v1.0.20 in a wide terminal that numbered list items render on single lines without the unexpected breaks described here. If you still see this on a current version, please feel free to reopen the issue with reproduction details.