fix: Don't add the new package to workspace.members if there is no ex…

…isting workspace in Cargo.toml.

src/cargo/ops/cargo_new.rs

@@ -15,7 +15,7 @@ use std::io::{BufRead, BufReader, ErrorKind};
 use std::path::{Path, PathBuf};
 use std::str::FromStr;
 use std::{fmt, slice};
-use toml_edit::{Array, Value};
+use toml_edit::Value;
 
 #[derive(Clone, Copy, Debug, PartialEq)]
 pub enum VersionControl {
@@ -992,11 +992,6 @@ fn update_manifest_with_new_member(
         if was_sorted {
             members.sort_by(|lhs, rhs| lhs.as_str().cmp(&rhs.as_str()));
         }
-    } else {
-        let mut array = Array::new();
-        array.push(display_path);
-
-        workspace_document["workspace"]["members"] = toml_edit::value(array);
     }
 
     write_atomic(

tests/testsuite/cargo_new/add_lib_into_non_workspace/out/Cargo.toml

@@ -1,4 +1,3 @@
-workspace = { members = ["bar"] }
 [package]
 name = "foo"
 version = "0.1.0"

tests/testsuite/cargo_new/mod.rs

@@ -1,3 +1,4 @@
+mod add_lib_into_non_workspace;
 mod add_members_to_workspace_format_previous_items;
 mod add_members_to_workspace_format_sorted;
 mod add_members_to_workspace_with_absolute_package_path;
@@ -12,4 +13,3 @@ mod inherit_workspace_package_table_with_edition;
 mod inherit_workspace_package_table_with_registry;
 mod inherit_workspace_package_table_without_version;
 mod not_inherit_workspace_package_table_if_not_members;
-mod add_lib_into_non_workspace;