When a render-worker process crashed or exited while the worker-pool
thread was writing a control message (e.g. right after an audio-sync and
drag operation triggered a new render), the main process received SIGPIPE
and terminated at WriteControlMessage().
- Ignore SIGPIPE in main() so QProcess can report the broken pipe through
its normal error path instead of killing the application.
- Harden WriteControlMessage() / TryWriteControlMessage() to check the
process state and the number of bytes written before waiting.
Mike-Solar
ea37dc5da6
