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Pop title/icon stack (CSI 23 ; 0 t)
ESC [ 23 ; 0 tXTWINOPS subcode 23 pops the most recent title and icon label from the internal stack pushed by CSI 22 t. The sequence is
CSI 23 ; 0 t (pop both), CSI 23 ; 1 t (pop icon only), or CSI 23 ; 2 t (pop title only). Always paired with a matching CSI 22 t push earlier in the session.
Used by long-running TUI applications (vim, tmux, ssh) to restore the original window title on exit. Push/pop is preferred over query/restore (CSI 21 t followed by OSC 2) because it doesn't expose the saved title to user-space processes — many modern terminals refuse to report titles for security but happily maintain a private title stack.How this is testedpartial
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\x1b[22;0t followed by \x1b[23;0t, verify both sequences are consumed and the terminal stays responsive.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 9 of 14 backends (64%)
Terminal Applications
| Terminal | Version | Support | Notes |
|---|---|---|---|
| iTerm2 | 3.6.9 | ✓ yes | Sequence consumed; terminal responsive |
| Ghostty | 1.3.1 | ✓ yes | Sequence consumed; terminal responsive |
| Terminal.app | 2.15 | ✓ yes | Sequence consumed; terminal responsive |
| Kitty | 0.46.2 | ✓ yes | Title stack not exposed via Python batch bridge |
| VS Code | 1.113.0 | ? unknown | |
| Warp | 0.2026.03.18.08.24.03 | ? unknown | |
| Cursor | 2.6.21 | ? unknown |