From ad0c343d36cbcf950baba9ca3ec8285f0602430e Mon Sep 17 00:00:00 2001
From: Maciej Olko <maciej.olko@affirm.com>
Date: Sat, 4 Jan 2025 01:30:03 +0100
Subject: [PATCH] Trim leading whitespace before doctest flags (#13164)

---
 sphinx/ext/doctest.py                                         | 2 +-
 tests/test_transforms/test_transforms_post_transforms_code.py | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/sphinx/ext/doctest.py b/sphinx/ext/doctest.py
index 462f5ea5e..5d78ebeb2 100644
--- a/sphinx/ext/doctest.py
+++ b/sphinx/ext/doctest.py
@@ -38,7 +38,7 @@ if TYPE_CHECKING:
 logger = logging.getLogger(__name__)
 
 blankline_re = re.compile(r'^\s*<BLANKLINE>', re.MULTILINE)
-doctestopt_re = re.compile(r'#\s*doctest:.+$', re.MULTILINE)
+doctestopt_re = re.compile(r'[ \t]*#\s*doctest:.+$', re.MULTILINE)
 
 
 def is_allowed_version(spec: str, version: str) -> bool:
diff --git a/tests/test_transforms/test_transforms_post_transforms_code.py b/tests/test_transforms/test_transforms_post_transforms_code.py
index a4243fb85..73bfcf49a 100644
--- a/tests/test_transforms/test_transforms_post_transforms_code.py
+++ b/tests/test_transforms/test_transforms_post_transforms_code.py
@@ -15,6 +15,8 @@ def test_trim_doctest_flags_html(app):
     assert 'QUUX' not in result
     assert 'CORGE' not in result
     assert 'GRAULT' in result
+    assert '<span class="n">now</span><span class="p">()</span>   \n' not in result
+    assert '<span class="n">now</span><span class="p">()</span>\n' in result
 
 
 @pytest.mark.sphinx(