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b8ceba97ed
Review follow-up on the salvaged #47772 work. Three defects made the filter a no-op or actively harmful in production, plus both Copilot review items. 1. The blank-line burst filter never fired. pty_bridge.py spawns via ptyprocess.PtyProcess.spawn() and never calls setraw(), so the PTY line discipline runs with ONLCR: every LF the child writes reaches xterm as CRLF. The /\n{50,}/ pattern requires consecutive LF, so a real 1000-row burst matched nothing (verified against a live PTY: b"A"+b"\n"*5+b"B" is read back as b"A\r\n\r\n\r\n\r\n\r\nB"). Now matches /(?:\r?\n){50,}/. 2. Bursts split across WebSocket frames were not collapsed. bridge.read() does os.read(fd, 65536) per drain tick and each read is forwarded as its own frame, so a burst spans frames and each fragment fell under the 50 threshold (3000 rows survived in a 40-byte-read simulation). The sanitizer now holds back a trailing newline run — including a lone trailing CR, since a frame can split a CRLF pair — and resolves it on the next frame or on flush. 3. Erase-code stripping was permanent, not resume-scoped. resumeParam is the durable session identity and is never cleared after connect, so every spinner/progress/status redraw in a resumed session lost its ESC[K and left stale glyphs. Suppression is now bounded to PTY_RESUME_SANITIZE_WINDOW_MS (30s) after connect; burst collapsing still applies for the life of the socket. Copilot review items: - flush() no longer writes a buffered partial CSI into xterm. #pending only ever holds an incomplete sequence, and emitting one leaves the parser in an in-escape state that swallows output after reconnect. A buffered newline run is still emitted (collapsed). - Test expectations updated accordingly. Tests: 29 cases (was 18), now using CRLF fixtures that match real PTY output, plus cross-frame burst reassembly, CRLF-pair frame splits, and post-window erase preservation. Full web suite 135 passing. |
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