When not sending data to a subprocess, close its stdin
We were letting stdin untouched, which meant child processes had access to our terminal input. That meant `!fmt` was trying to read from our terminal input and catching keystrokes. Fixes #1281
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@ -171,6 +171,8 @@ std::pair<String, int> ShellManager::eval(
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close(child_stdin.write_fd());
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move(child_stdin.read_fd(), 0);
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}
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else
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close(0);
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close(child_stdout.read_fd());
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move(child_stdout.write_fd(), 1);
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