mitigate prompt issue

src/PowerShellEditorServices/Services/PowerShellContext/PowerShellContextService.cs

@@ -199,7 +199,7 @@ public RunspaceDetails CurrentRunspace
 
             EditorServicesPSHostUserInterface hostUserInterface =
                 hostStartupInfo.ConsoleReplEnabled
-                    ? (EditorServicesPSHostUserInterface) new TerminalPSHostUserInterface(powerShellContext, hostStartupInfo.PSHost, shouldUsePSReadLine, logger)
+                    ? (EditorServicesPSHostUserInterface) new TerminalPSHostUserInterface(powerShellContext, hostStartupInfo.PSHost, logger)
                     : new ProtocolPSHostUserInterface(languageServer, powerShellContext, logger);
 
             EditorServicesPSHost psHost =

src/PowerShellEditorServices/Services/PowerShellContext/Session/Host/EditorServicesPSHostUserInterface.cs

@@ -35,7 +35,6 @@ public abstract class EditorServicesPSHostUserInterface :
         private readonly ConcurrentDictionary<ProgressKey, object> currentProgressMessages =
             new ConcurrentDictionary<ProgressKey, object>();
 
-        private readonly bool _isPSReadLineEnabled;
         private PromptHandler activePromptHandler;
         private PSHostRawUserInterface rawUserInterface;
         private CancellationTokenSource commandLoopCancellationToken;
@@ -106,13 +105,11 @@ public abstract class EditorServicesPSHostUserInterface :
         public EditorServicesPSHostUserInterface(
             PowerShellContextService powerShellContext,
             PSHostRawUserInterface rawUserInterface,
-            bool isPSReadLineEnabled,
             ILogger logger)
         {
             this.Logger = logger;
             this.powerShellContext = powerShellContext;
             this.rawUserInterface = rawUserInterface;
-            _isPSReadLineEnabled = isPSReadLineEnabled;
 
             this.powerShellContext.DebuggerStop += PowerShellContext_DebuggerStop;
             this.powerShellContext.DebuggerResumed += PowerShellContext_DebuggerResumed;
@@ -852,12 +849,14 @@ private async Task StartReplLoopAsync(CancellationToken cancellationToken)
                 }
                 finally
                 {
-                    // This supplies the newline in the Legacy ReadLine when executing code in the terminal via hitting the ENTER key.
-                    // Without this, hitting ENTER with a no input looks like it does nothing (no new prompt is written)
+                    // This supplies the newline in the Legacy ReadLine when executing code in the terminal via hitting the ENTER key
+                    // or Ctrl+C. Without this, hitting ENTER with a no input looks like it does nothing (no new prompt is written)
                     // and also the output would show up on the same line as the code you wanted to execute (the prompt line).
-                    // Since PSReadLine handles ENTER internally to itself, we only want to do this when using the Legacy ReadLine.
-                    if (!_isPSReadLineEnabled &&
-                        !cancellationToken.IsCancellationRequested &&
+                    // This is AlSO applied to PSReadLine for the Ctrl+C scenario which appears like it does nothing...
+                    // TODO: This still gives an extra newline when you hit ENTER in the PSReadLine experience. We should figure
+                    // out if there's any way to avoid that... but unfortunately, in both scenarios, we only see that empty
+                    // string is returned.
+                    if (!cancellationToken.IsCancellationRequested &&
                         originalCursorTop == await ConsoleProxy.GetCursorTopAsync(cancellationToken).ConfigureAwait(false))
                     {
                         this.WriteLine();

src/PowerShellEditorServices/Services/PowerShellContext/Session/Host/ProtocolPSHostUserInterface.cs

@@ -33,7 +33,6 @@ internal class ProtocolPSHostUserInterface : EditorServicesPSHostUserInterface
             : base (
                 powerShellContext,
                 new SimplePSHostRawUserInterface(logger),
-                isPSReadLineEnabled: false,
                 logger)
         {
             _languageServer = languageServer;

src/PowerShellEditorServices/Services/PowerShellContext/Session/Host/TerminalPSHostUserInterface.cs

@@ -38,12 +38,10 @@ public class TerminalPSHostUserInterface : EditorServicesPSHostUserInterface
         public TerminalPSHostUserInterface(
             PowerShellContextService powerShellContext,
             PSHost internalHost,
-            bool isPSReadLineEnabled,
             ILogger logger)
             : base (
                 powerShellContext,
                 new TerminalPSHostRawUserInterface(logger, internalHost),
-                isPSReadLineEnabled,
                 logger)
         {
             this.internalHostUI = internalHost.UI;