fix prompts on startup (#3056)

* fix prompts on startup

* Try again

tests/shell/pipeline/commands/internal.rs

@@ -220,6 +220,51 @@ fn autoenv() {
     })
 }
 
+// #[cfg(feature = "which")]
+// #[test]
+// fn nu_let_env_overwrites() {
+//     Playground::setup("syncs_env_test_1", |dirs, sandbox| {
+//         sandbox.with_files(vec![FileWithContent(
+//             "configuration.toml",
+//             r#"
+//             [env]
+//             SHELL = "/usr/bin/you_already_made_the_nu_choice"
+//         "#,
+//         )]);
+
+//         let mut file = dirs.test().clone();
+//         file.push("configuration.toml");
+
+//         let fake_config = FakeConfig::new(&file);
+//         let mut actual = EnvironmentSyncer::new();
+//         actual.set_config(Box::new(fake_config));
+
+//         // Here, the environment variables from the current session
+//         // are cleared since we will load and set them from the
+//         // configuration file (if any)
+//         actual.clear_env_vars(&mut ctx);
+
+//         // Nu loads the environment variables from the configuration file (if any)
+//         actual.load_environment();
+
+//         // By this point, Nu has already loaded the environment variables
+//         // stored in the configuration file. Before continuing we check
+//         // if any new environment variables have been added from the ones loaded
+//         // in the configuration file.
+//         //
+//         // Nu sees the missing "USER" variable and accounts for it.
+//         actual.sync_env_vars(&mut ctx);
+
+//         let actual = nu!(
+//             cwd: dirs.test(),
+//             r#"let-env SHELL = bob
+//             echo $nu.env.SHELL
+//             "#
+//         );
+//         assert!(actual.out.ends_with("set_in_foo"))
+//     });
+// }
+
 #[test]
 fn invocation_properly_redirects() {
     let actual = nu!(