Syntax highlighting colors offset/misaligned in Windows Terminal (CRLF line ending issue)

Description

Syntax highlighting colors are offset from the text they should highlight in Windows Terminal. The offset accumulates progressively (~1 character per line), making code blocks increasingly unreadable.

Environment

• Claude Code v2.1.19
• Windows Terminal (dark theme)
• Windows 10/11

Analysis

The offset appears related to Windows line endings (\r\n). Each newline adds ~1 character of drift, suggesting the carriage return (\r) is being counted in width calculations but not rendered.

Observed behavior:

• First highlighted line: off by ~4 characters
• Subsequent lines: drift increases (~1 char per line)
• XML tags like <Patterns> have colors bleeding past tag boundaries
• Blue highlighting for tag names spans incorrect character ranges

Technical Investigation

@shcv performed a detailed analysis: https://gist.github.com/shcv/cc30c3b32e928ac48f48de4335a4280b

Root cause: In pretty-v2.1.19.js, control characters like \r may be counted as having display width during tokenization, while the terminal correctly renders them as zero-width. This causes cursor positioning to drift during differential rendering.

Proposed fixes:

1. Treat control characters (code ≤ 31) as zero-width in width calculations
2. Normalize \r\n to \n before syntax highlighting

Screenshots

<img width="1121" height="220" alt="Image" src="https://github.com/user-attachments/assets/418e30a1-6bed-48b2-b315-1e48b6d2fa8e" />
<img width="1674" height="1170" alt="Image" src="https://github.com/user-attachments/assets/95929f7f-290a-46d1-a85e-b11c702fa8b3" />