[BUG] 01-BUG-bash-output-scroll-regression

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Bug Report: Bash Output Scroll Position Regression in Fullscreen Mode

Reported: 2024-11-12
Reporter: Bruce (@energyscholar)
Severity: Medium
Component: Bash Output Panel / UI
Environment: ChromeOS + Linux Container

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Summary

In fullscreen mode, the bash output panel intermittently scrolls to top during command execution, making it impossible to monitor long-running processes. Issue does not occur in windowed mode.

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Reproduction

Prerequisites:

• Claude Code in Chrome browser (ChromeOS)
• Fullscreen mode (F11 or browser fullscreen)

Steps:

1. Enter fullscreen mode
2. Execute long-running bash command (e.g., npm start, tail -f logfile)
3. Observe scroll position

Expected: Scroll stays at bottom (auto-follow) or maintains user position
Actual: Scroll jumps to top repeatedly as new output arrives

Reproduction Rate: 100% in fullscreen, 0% in windowed mode

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Technical Details

Environment:

OS:           ChromeOS (Chromebook Plus 514)
Container:    Debian Linux 6.6.88-08646-g082267a5c5ac
Browser:      Chrome (ChromeOS native)
Shell:        bash 5.2.15(1)-release
Node:         v18.20.4
npm:          9.2.0
Claude Code:  2.0.37

Hypothesis:
Scroll behavior not tested in fullscreen on ChromeOS/Linux. Possible viewport calculation issue when browser chrome hidden.

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Impact

User Impact:

• Cannot monitor streaming logs (dev servers, builds, tests)
• Manual scroll-down required every 1-2 seconds
• Workaround: exit fullscreen or use external terminal

Business Impact:

• Reduced developer productivity
• Poor UX for legitimate use case (fullscreen focus mode)

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Suggested Fix

Investigate scroll anchor behavior when:

1. Browser in fullscreen mode
2. Viewport dimensions change (fullscreen transition)
3. New content appended to bash output

Standard terminal behavior: scroll-lock to bottom unless user scrolls up manually.

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Submission Checklist

• [ ] Verify issue still present (test fullscreen mode)
• [x] Claude Code version added: 2.0.37
• [ ] Submit to: https://github.com/anthropics/claude-code/issues
• [ ] Record issue URL: ____________________

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Contact: @energyscholar on GitHub
Project Context: Traveller Combat VTT (Node.js/React)
File: /home/bruce/software/bug_reports_claude/01-BUG-bash-output-scroll-regression.md

What Should Happen?

Detailed in above bug report

Error Messages/Logs

Detailed in bug report

Steps to Reproduce

Detailed in bug report. Complicated.

Claude Model

Sonnet (default)

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.0.37 (Claude Code)

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

Should all be in the bug report. These came up a few days ago. Claude suggested I should send them in immediately.

01-BUG-bash-output-scroll-regression.md