GNU `screen -dmS` causes commandline to break and CPU spin

[lionkor]

1. Run commandline_test as screen -dmS test commandline_test
2. Observe 100% CPU spin
3. Attach via screen -r test and observe completely bugged input

• [ ] screen -dmS should work as expected
• [ ] there should be no CPU spin possible

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Notes

• it may be that isatty() changes after initialization(?)