[BUG] TUI visual artifacts during diff view in PyCharm integrated terminal

[youssefahmed2017]

Preflight Checklist

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

What's Wrong?

While Claude Code was displaying a diff/edit view inside PyCharm's integrated terminal, the UI showed several visual artifacts simultaneously:

• A large I-beam cursor floating mid-screen, overlapping the code content
• Red diff highlighting bleeding incorrectly across multiple lines
• General visual corruption in the diff area during an active agentic edit

Environment

Field	Value
Claude Code version	2.1.220 (Claude Code)
OS	Windows 11 24H2
Terminal	PyCharm built-in integrated terminal
Shell	[PowerShell 7.6.4

What Should Happen?

Clean diff rendering with no overlapping cursor or bleeding highlights.

Actual Behavior

See attached screenshot.

Related Issues

Similar to #20627 and #22076, but those are specific to Windows Terminal / cmd.exe. This occurs in PyCharm's terminal specifically during diff rendering.

Error Messages/Logs

Steps to Reproduce

1. Open Claude Code inside PyCharm's integrated terminal
2. Let Claude Code enter auto mode and begin editing a file
3. Observe the diff view — artifacts appear in the highlighted region
   NOTE: It didn't happen every time I did with these Steps. So it only happened ONE TIME. I still don't know how it happened tho

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

No response

Claude Code Version

2.1.220 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PyCharm terminal

Additional Information

Image of it looking broken: