Eric Traut 0d3868a30c
Wait for SIGCONT when resuming the TUI ( #51192 ) ...
## What changed
Install a temporary `SIGCONT` handler and unblock the signal during `Ctrl+Z` suspension. After sending `SIGTSTP`, wait for the handler to confirm resumption, returning a timeout error if no confirmation arrives within the bounded wait.
Restore the previous signal handler and thread signal mask, resume terminal stderr handling, and reapply terminal modes even when suspension fails. Propagate signal setup, delivery, and restoration errors to the caller.
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Eric Traut
0d3868a30c