[BUG] Text overlapping/doubling in terminal after scrolling up or down.

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 Title:
Text overlapping/doubling in terminal after scrolling - screen buffer not clearing properly

Description:
Claude Code's terminal output is not properly clearing the screen buffer when scrolling up or down, causing text
to overlap and display multiple times. New text is being rendered on top of old text instead of replacing it,
making the output unreadable.

Steps to Reproduce:

1. Start Claude Code in terminal
2. Run a task that generates substantial output (e.g., build operations, file edits)
3. Scroll up or down in the terminal
4. Observe text overlapping and doubling

Expected Behavior:

• Terminal should properly clear previous text when scrolling
• New text should replace old text, not overlay on top of it
• Screen buffer should be managed correctly to prevent text overlap

Actual Behavior:

• Text appears doubled/overlapped on the same lines
• Previous content is not cleared before rendering new content
• Examples from screenshots:
• Code lines (CFLAGS, INCDIR, LIBS) appear duplicated on top of each other
• Status messages like "accept edits on (shift+tab to cycle)" repeat multiple times
• Makes output difficult or impossible to read

Environment:

• OS: Windows (running in WSL2 based on context)
• Platform: Linux 6.6.87.2-microsoft-standard-WSL2
• Claude Code version: Claude Code v2.0.32
• Terminal: Ubuntu

Screenshots:

• claudecodeerror.jpg - Shows overlapping CFLAGS/INCDIR/LIBS definitions
• claudecodeerror2.jpg - Shows repeated "accept edits" status messages

Additional Context:
This appears to be a terminal control character or screen buffer management issue. The problem persists during
longer operations and makes it difficult to read Claude's output and responses.

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What Should Happen?

text shouldn't double up/glitch out when scrolling up/down.

Error Messages/Logs

Steps to Reproduce

n/a

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

n/a

Claude Code Version

Claude Code v2.0.32

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

I am running Claude Code within the Ubuntu terminal window.