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Combining characters (0 cols)
Combining characters (like accents, diacritical marks) attach to the preceding base character and should occupy zero additional columns. For example, é can be written as e + U+0301 (combining acute accent) — the cursor should advance by 1 column, not 2.
How this is testedautomated
Write a base character followed by a combining accent (e.g., e + U+0301), verify the combined character occupies 1 column, not 2.
Write a base character followed by a combining accent (e.g., e + U+0301), verify the combined character occupies 1 column, not 2.
The same probe runs against headless backends (via Termless) and real terminal apps (via a daemon launched in each terminal). This lets us distinguish parser correctness from rendering correctness.
Analysis2026-04-06
Supported by 13 of 14 backends (93%)
Terminal Applications
| Terminal | Version | Support | Notes |
|---|---|---|---|
| iTerm2 | 3.6.9 | ✓ yes | |
| Ghostty | 1.3.1 | ✓ yes | |
| VS Code | ✓ yes | ||
| Warp | ✓ yes | ||
| Cursor | ✓ yes | ||
| Terminal.app | ✓ yes |