Summary

The integrated terminal does not correctly render Unicode nonspacing marks (Unicode General Category Mn), such as combining diacritical marks. This affects the display of text in many languages that use diacritics.

Steps to Reproduce

Run the following python code in the terminal.

import unicodedata
token = "Caf\u00e9"
print(token)
print(len(token))
print(unicodedata.normalize('NFKD', token))
print(len(unicodedata.normalize('NFKD', token)))

Expected Behavior

Unicode nonspacing marks (General Category Mn) should be correctly rendered and attached to their base characters. For example, 'e' + U+0301 should display as é.

Ghostty:

Actual Behavior

Unicode nonspacing marks (Mn characters) are not rendered, causing text to display as just the base character without diacritics. For example, 'e' + U+0301 displays as e instead of é.

Zed Version and System Specs

Zed: v0.207.0 (Zed Preview)
OS: macOS 26.0.1
Memory: 32 GiB
Architecture: aarch64