Use separate overload instead of optional argument

So as to now add a binary breaking change.

Co-authored-by: Patrick Meinecke <[email protected]>

Author: andyleejordan

src/PowerShellEditorServices/Extensions/EditorWorkspace.cs

@@ -39,11 +39,16 @@ public sealed class EditorWorkspace
         #region Public Methods
         // TODO: Consider returning bool instead of void to indicate success?
 
+        /// <summary>
+        /// Creates a new file in the editor.
+        /// </summary>
+        public void NewFile() => editorOperations.NewFileAsync(string.Empty).Wait();
+
         /// <summary>
         /// Creates a new file in the editor.
         /// </summary>
         /// <param name="content">The content to place in the new file.</param>
-        public void NewFile(string content = "") => editorOperations.NewFileAsync(content).Wait();
+        public void NewFile(string content) => editorOperations.NewFileAsync(content).Wait();
 
         /// <summary>
         /// Opens a file in the workspace. If the file is already open

src/PowerShellEditorServices/Extensions/IEditorOperations.cs

@@ -38,12 +38,18 @@ internal interface IEditorOperations
         /// <returns>The resolved file path.</returns>
         string GetWorkspaceRelativePath(ScriptFile scriptFile);
 
+        /// <summary>
+        /// Causes a new untitled file to be created in the editor.
+        /// </summary>
+        /// <returns>A task that can be awaited for completion.</returns>
+        Task NewFileAsync();
+
         /// <summary>
         /// Causes a new untitled file to be created in the editor.
         /// </summary>
         /// <param name="content">The content to insert into the new file.</param>
         /// <returns>A task that can be awaited for completion.</returns>
-        Task NewFileAsync(string content = "");
+        Task NewFileAsync(string content);
 
         /// <summary>
         /// Causes a file to be opened in the editor.  If the file is