Add support for Esc key to cancel SelectionPrompt (Fixes #851)

Author: nimobit

src/Spectre.Console/Prompts/List/ListPrompt.cs

@@ -66,11 +66,18 @@ public async Task<ListPromptState<T>> Show(
 
                 var key = rawKey.Value;
                 var result = _strategy.HandleInput(key, state);
+
                 if (result == ListPromptInputResult.Submit)
                 {
                     break;
                 }
 
+                if (result == ListPromptInputResult.Cancel)
+                {
+                    throw new OperationCanceledException("Prompt cancelled via ESC key.");
+                }
+
+
                 if (state.Update(key) || result == ListPromptInputResult.Refresh)
                 {
                     hook.Refresh();

src/Spectre.Console/Prompts/List/ListPromptInputResult.cs

@@ -6,4 +6,5 @@ internal enum ListPromptInputResult
     Refresh = 1,
     Submit = 2,
     Abort = 3,
+    Cancel = 4,
 }

src/Spectre.Console/Prompts/SelectionPrompt.cs

@@ -109,6 +109,11 @@ public async Task<T> ShowAsync(IAnsiConsole console, CancellationToken cancellat
     /// <inheritdoc/>
     ListPromptInputResult IListPromptStrategy<T>.HandleInput(ConsoleKeyInfo key, ListPromptState<T> state)
     {
+        if (key.Key == ConsoleKey.Escape)
+{
+    return ListPromptInputResult.Cancel;
+}
+
         if (key.Key == ConsoleKey.Enter || key.Key == ConsoleKey.Spacebar || key.Key == ConsoleKey.Packet)
         {
             // Selecting a non leaf in "leaf mode" is not allowed

src/Tests/Spectre.Console.Tests/Unit/Prompts/SelectionPromptTests.cs

@@ -115,7 +115,8 @@ public void Should_Search_In_Remapped_Result()
         selection.ShouldBe(choices[1]);
     }
 
-    [Fact] public void Should_Throw_Meaningful_Exception_For_Empty_Prompt()
+    [Fact]
+    public void Should_Throw_Meaningful_Exception_For_Empty_Prompt()
     {
         // Given
         var console = new TestConsole();
@@ -130,6 +131,26 @@ [Fact] public void Should_Throw_Meaningful_Exception_For_Empty_Prompt()
         var exception = action.ShouldThrow<InvalidOperationException>();
         exception.Message.ShouldBe("Cannot show an empty selection prompt. Please call the AddChoice() method to configure the prompt.");
     }
+
+    [Fact]
+    public void SelectionPrompt_Should_Cancel_On_Esc()
+    {
+        // Arrange
+        var console = new TestConsole();
+        console.Profile.Capabilities.Ansi = true;
+        console.Profile.Capabilities.Interactive = true;
+        console.Input.PushKey(new ConsoleKeyInfo('\0', ConsoleKey.Escape, false, false, false));
+
+        var prompt = new SelectionPrompt<string>();
+        prompt.AddChoice("Option A");
+        prompt.AddChoice("Option B");
+
+        // Act & Assert
+        Assert.Throws<OperationCanceledException>(() =>
+        {
+            prompt.Show(console);
+        });
+    }
 }
 
 file sealed class CustomSelectionItem
@@ -143,3 +164,5 @@ public CustomSelectionItem(int value, string name)
         Name = name ?? throw new ArgumentNullException(nameof(name));
     }
 }
+
+