TerminalTile used to send every xterm onData chunk as a bare {t:'i'}
frame: no seq, no ACK, silently dropped while its socket was down, and
typing never acknowledged the session's idle alert. Keystrokes and
pastes now go through app._sendInputAsync over the tile's own socket,
registered in the input-socket map while open (HTTP fallback while
not), so they are ACKed, persisted until delivered, redelivered after a
drop, and the ACK clears the idle alert.
What xterm generates on its own stays out of that persisted queue: a
query reply (DA/CPR/OSC) is dropped, as the primary pane drops it, and a
focus or mouse report goes out once via _sendInputEphemeral. The tile's
socket carries the tab identity with a :tile suffix so it can never
evict the primary pane's socket.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
