On the signal-exit teardown path signal-exit re-raises the signal
immediately after the callback returns ({alwaysLast:false}), so a
buffered async stream.write can be lost before the process dies.
teardown(true) already flushes show-cursor, leave-alt-screen and
disable-kitty synchronously via fs.writeSync, but the bracketed-paste
-disable escape \x1b[?2004l was still written with an async
stdout.write on both teardown sub-paths (usePaste's onScopeDispose
-> detach during originalUnmount(), and the stdin controller dispose
backstop). When dropped, the user's shell stays in bracketed-paste
mode and wraps later pastes in \x1b[200~ ... \x1b[201~.
Thread a sync flag through the paste teardown, mirroring kitty:
disableBracketedPaste(sync) writes via fs.writeSync(fd, ...) when sync;
the stdin controller dispose(sync) forwards it; teardown passes sync at
the dispose() call site. Because Vue's unmount runs detach (async, lost
on signal) before dispose() and zeroes the live count, dispose(sync)
re-issues paste-OFF synchronously whenever paste was ever enabled --
paste-OFF is idempotent, so the redundant write is harmless. The normal
(non-signal) unmount path stays async, unchanged.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Yunfei He
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