Eric Traut 0ae94fdd49
Respond to terminal queries from TTY subprocesses ( #41436 ) ...
## Why
Programs running in a PTY can block while waiting for replies to terminal
queries.
## What changed
- Intercept device-status, window-size, cursor-position, and DEC private-mode
queries from TTY subprocess output and write bounded responses to the
subprocess input.
- Remove handled queries from the output stream while preserving other escape
sequences and output, including queries split across chunks.
- Apply the responder to both direct and driver-backed TTY process spawning.
## Testing
Added tests for driver-backed query handling and for a PTY subprocess that
waits for a cursor-position response before exiting.
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Eric Traut
0ae94fdd49