nix repl: Only hide the progress bar while waiting for user input #9476
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In commit 0d2163c, the progress bar was hidden in nix repl because of a regression that caused it to interfere with user input. Several users like(d) seeing the progress bar in the repl during builds. Only hiding it while waiting for user input gives us the best of both worlds, so do just that.
Context
Mentioned in #9412.
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