Support select all shortcut in scripting editor read-only region.

src/AddIns/BackendBindings/Scripting/Project/Src/ScriptingConsole.cs

@@ -153,6 +153,7 @@ namespace ICSharpCode.Scripting
 					case Key.Down:
 						return false;
 					case Key.C:
+					case Key.A:
 						return keyModifiers != ModifierKeys.Control;
 					default:
 						return true;

src/AddIns/BackendBindings/Scripting/Test/Console/ScriptingConsoleReadOnlyRegionsTests.cs

@@ -164,5 +164,14 @@ namespace ICSharpCode.Scripting.Tests.Console
 			
 			Assert.IsFalse(result);
 		}
+		
+		[Test]
+		public void PreviewKeyDown_ControlAInReadOnlyRegion_HandledSetToFalseSoSelectAllInReadOnlyRegionAllowed()
+		{
+			FakeConsoleTextEditor.RaisePreviewKeyDownEventForDialogKey(Key.Left);
+			bool result = FakeConsoleTextEditor.RaisePreviewKeyDownEvent(Key.A, ModifierKeys.Control);
+			
+			Assert.IsFalse(result);
+		}
 	}
 }