From 570a34eb6e8a0f91f3500f1242d61558abe20157 Mon Sep 17 00:00:00 2001
From: Abhishek <akvikramaditya007cppcoder@gmail.com>
Date: Wed, 11 Nov 2026 22:52:08 +0530
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=9B=20FIX:=20Render=20the=20task=20lis?=
 =?UTF-8?q?t=20checkbox=20after=20any=20GFM=20whitespace?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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#42 made a tab or form feed after [ ] / [x] count as a task list marker,
but make_checkbox still only matched a literal space. The marker was
stripped and an empty html_inline was inserted, so the checkbox vanished,
and with label_after the leftover ' id="task-item-...">' text leaked
into the page.
---
 mdit_py_plugins/tasklists/__init__.py | 6 ++++--
 tests/fixtures/tasklists.md           | 8 ++++----
 tests/test_tasklists.py               | 2 ++
 3 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/mdit_py_plugins/tasklists/__init__.py b/mdit_py_plugins/tasklists/__init__.py
index 089bb5d..81a9bd4 100644
--- a/mdit_py_plugins/tasklists/__init__.py
+++ b/mdit_py_plugins/tasklists/__init__.py
@@ -108,12 +108,14 @@ def todoify(token: Token) -> None:
     def make_checkbox(token: Token) -> Token:
         checkbox = Token("html_inline", "", 0)
         disabled_attr = 'disabled="disabled"' if disable_checkboxes else ""
-        if token.content.startswith("[ ] "):
+        # starts_with_todo_markdown already matched "[ ]", "[x]" or "[X]" followed by
+        # any GFM whitespace, so only the character inside the brackets matters here
+        if token.content[1] == " ":
             checkbox.content = (
                 '<input class="task-list-item-checkbox" '
                 f'{disabled_attr} type="checkbox">'
             )
-        elif token.content.startswith("[x] ") or token.content.startswith("[X] "):
+        else:
             checkbox.content = (
                 '<input class="task-list-item-checkbox" checked="checked" '
                 f'{disabled_attr} type="checkbox">'
diff --git a/tests/fixtures/tasklists.md b/tests/fixtures/tasklists.md
index dec0fef..9b209f2 100644
--- a/tests/fixtures/tasklists.md
+++ b/tests/fixtures/tasklists.md
@@ -114,8 +114,8 @@ Tab after task list item marker
 + [ ]		item 2
 .
 <ul class="contains-task-list">
-<li class="task-list-item">	item 1</li>
-<li class="task-list-item">		item 2</li>
+<li class="task-list-item"><input class="task-list-item-checkbox" checked="checked" disabled="disabled" type="checkbox">	item 1</li>
+<li class="task-list-item"><input class="task-list-item-checkbox" disabled="disabled" type="checkbox">		item 2</li>
 </ul>
 .
 
@@ -125,7 +125,7 @@ Form feed after task list item marker
 + [ ]item 2
 .
 <ul class="contains-task-list">
-<li class="task-list-item">item 1</li>
-<li class="task-list-item">item 2</li>
+<li class="task-list-item"><input class="task-list-item-checkbox" checked="checked" disabled="disabled" type="checkbox">item 1</li>
+<li class="task-list-item"><input class="task-list-item-checkbox" disabled="disabled" type="checkbox">item 2</li>
 </ul>
 .
diff --git a/tests/test_tasklists.py b/tests/test_tasklists.py
index 7a21218..54a30e0 100644
--- a/tests/test_tasklists.py
+++ b/tests/test_tasklists.py
@@ -45,6 +45,8 @@ def test_all(line, title, input, expected):
         ),
         pytest.param("- [x] a & b\n", " a &amp; b", id="ampersand"),
         pytest.param("- [ ] plain task\n", " plain task", id="plain"),
+        pytest.param("- [ ]\tplain task\n", "\tplain task", id="tab-unchecked"),
+        pytest.param("- [x]\tplain task\n", "\tplain task", id="tab-checked"),
     ],
 )
 def test_label_after_is_escaped(source, label):