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Overwrite at cursor
Tests whether writing a character at the cursor position overwrites the existing character at that position. This is the default behavior in replace mode (IRM off) — characters replace whatever was previously at the cursor location.
How this is testedautomated
Write "AB", move to col 1 via
Write "AB", move to col 1 via
\x1b[1G, write "C", verify cell (0,0) is "C" (overwrote "A").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 all 12 tested terminals — universal adoption. Part of the Core TUI baseline.
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 |