Do not transform text if color=False

Author: savannahostrowski

Doc/library/argparse.rst

@@ -657,7 +657,7 @@ To highlight command examples in your description or epilog text, you can use
 
 When colors are enabled, the text inside ``[cmd]...[/cmd]`` tags will be
 displayed in a distinct color to help examples stand out. When colors are
-disabled, the tags are stripped and the content is displayed as plain text.
+disabled, no transformation is applied and the tags remain as-is.
 
 .. note::
 

Lib/argparse.py

@@ -526,8 +526,12 @@ def _apply_text_markup(self, text):
 
         Supported markup:
           [cmd]...[/cmd] - command/shell example (single color)
+
+        When colors are disabled, no transformation is applied.
         """
         t = self._theme
+        if not t.reset:
+            return text
         text = _re.sub(
             r'\[cmd\](.*?)\[/cmd\]',
             rf'{t.prog_extra}\1{t.reset}',

Lib/test/test_argparse.py

@@ -7618,16 +7618,15 @@ def test_cmd_markup_multiple_tags(self):
         self.assertIn(f'{prog_extra}app test{reset}', help_text)
 
     def test_cmd_markup_not_applied_when_color_disabled(self):
+        # When color is disabled, markup is not transformed (tags remain as-is)
         parser = argparse.ArgumentParser(
             prog='PROG',
             color=False,
             epilog='Example: [cmd]python -m myapp[/cmd]',
         )
 
         help_text = parser.format_help()
-        self.assertNotIn('[cmd]', help_text)
-        self.assertNotIn('[/cmd]', help_text)
-        self.assertIn('python -m myapp', help_text)
+        self.assertIn('[cmd]python -m myapp[/cmd]', help_text)
         self.assertNotIn('\x1b[', help_text)
 
     def test_cmd_markup_unclosed_tag_unchanged(self):