Improve newline output in command prompt loop

Author: daviwil

src/PowerShellEditorServices/Session/Host/EditorServicesPSHostUserInterface.cs

@@ -720,8 +720,6 @@ private async Task StartReplLoop(CancellationToken cancellationToken)
 
                 if (commandString != null)
                 {
-                    this.WriteOutput(string.Empty);
-
                     if (!string.IsNullOrWhiteSpace(commandString))
                     {
                         var unusedTask =
@@ -735,6 +733,10 @@ private async Task StartReplLoop(CancellationToken cancellationToken)
 
                         break;
                     }
+                    else
+                    {
+                        this.WriteOutput(string.Empty);
+                    }
                 }
             }
             while (!cancellationToken.IsCancellationRequested);

src/PowerShellEditorServices/Session/PowerShellContext.cs

@@ -715,11 +715,12 @@ public async Task<IEnumerable<object>> ExecuteScriptString(
             bool writeOutputToHost,
             bool addToHistory)
         {
+            // Get rid of leading and trailing whitespace and newlines
+            scriptString = scriptString.Trim();
+
             if (writeInputToHost)
             {
-                this.WriteOutput(
-                    scriptString + Environment.NewLine,
-                    true);
+                this.WriteOutput(scriptString, false);
             }
 
             PSCommand psCommand = new PSCommand();