[Bug] Terminal flickering/rapid scrolling during response streaming on Windows 11

Bug Description
Environment

• OS: Windows 11 (Version 10.0.26200.7462)
• Terminal: Windows Terminal (check version in Settings → About)
• Node.js: v24.9.0
• Claude Code: 2.0.76

Issue Description

When Claude Code starts processing a prompt and begins responding, the terminal display shakes/scrolls rapidly up and down. The scrolling is very fast and continuous, making the output unreadable. The only way to stop it is by pressing Escape to cancel the prompt.

Steps to Reproduce

1. Open Claude Code in Windows Terminal
2. Enter any prompt that triggers a response
3. Observe the terminal rapidly scrolling/shaking as Claude begins responding

Expected Behavior

Terminal should display Claude's response smoothly without flickering or rapid scrolling.

Actual Behavior

Terminal content rapidly scrolls up and down, appearing to "shake," until the prompt is cancelled with Escape.

Workarounds Attempted

• export CLAUDE_CODE_DISABLE_TERMINAL_TITLE=1 - did not fix
• export TERM=dumb - did not fix
• /terminal-setup - did not fix
• Resizing terminal window - did not fix
• Toggling Windows Terminal GPU rendering - did not fix

Additional Context

The issue appears to be related to the status line/progress indicator rendering during response streaming.

Environment Info

• Platform: win32
• Terminal: windows-terminal
• Version: 2.0.76
• Feedback ID: 54245156-a10d-4429-9fd8-2e380aee4e93

Errors

[{"error":"Error: Request was aborted.\n    at _0A._createMessage (file:///C:/Users/Shehata/AppData/Roaming/npm/node_modules/@anthropic-ai/claude-code/cli.js:514:3157)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)","timestamp":"2026-01-08T20:35:26.381Z"}]