Fix raw markup printed on prompt errors sometimes

rich/prompt.py

@@ -262,7 +262,7 @@ def on_validate_error(self, value: str, error: InvalidResponse) -> None:
             value (str): String entered by user.
             error (InvalidResponse): Exception instance the initiated the error.
         """
-        self.console.print(error)
+        self.console.print(error, markup=True)
 
     def pre_prompt(self) -> None:
         """Hook to display something before the prompt."""

tests/test_prompt.py

@@ -111,3 +111,16 @@ def test_prompt_confirm_default():
     output = console.file.getvalue()
     print(repr(output))
     assert output == expected
+
+
+def test_prompt_confirm_markup():
+    INPUT = "foo\nNO\ny"
+    console = Console(file=io.StringIO(), markup=False)
+    answer = Confirm.ask(
+        "continue", console=console, stream=io.StringIO(INPUT), default=True
+    )
+    assert answer is True
+    expected = "continue [y/n] (y): Please enter Y or N\ncontinue [y/n] (y): Please enter Y or N\ncontinue [y/n] (y): "
+    output = console.file.getvalue()
+    print(repr(output))
+    assert output == expected