feat: add markdown editor waffle flag (#36512)

This PR adds contentstore.use_react_markdown_editor course waffle flag in cms.
This flag helps in enabling the markdown editor in the authoring mfe.

This PR also adds the markdown_edited field in the Problem Xblock to persist the
user's choice of switching to the markdown editor on the authoring MFE.

More details in the authoring MFE PR: openedx/frontend-app-authoring#1805

cms/djangoapps/contentstore/rest_api/v1/serializers/course_waffle_flags.py

@@ -28,6 +28,7 @@ class CourseWaffleFlagsSerializer(serializers.Serializer):
     use_new_textbooks_page = serializers.SerializerMethodField()
     use_new_group_configurations_page = serializers.SerializerMethodField()
     enable_course_optimizer = serializers.SerializerMethodField()
+    use_react_markdown_editor = serializers.SerializerMethodField()
 
     def get_course_key(self):
         """
@@ -152,3 +153,10 @@ class CourseWaffleFlagsSerializer(serializers.Serializer):
         """
         course_key = self.get_course_key()
         return toggles.enable_course_optimizer(course_key)
+
+    def get_use_react_markdown_editor(self, obj):
+        """
+        Method to get the use_react_markdown_editor waffle flag
+        """
+        course_key = self.get_course_key()
+        return toggles.use_react_markdown_editor(course_key)

cms/djangoapps/contentstore/rest_api/v1/views/course_waffle_flags.py

@@ -62,6 +62,7 @@ class CourseWaffleFlagsView(APIView):
             "use_new_certificates_page": true,
             "use_new_textbooks_page": true,
             "use_new_group_configurations_page": true
+            "use_react_markdown_editor": true,
         }
         ```
         """

cms/djangoapps/contentstore/rest_api/v1/views/tests/test_course_waffle_flags.py

@@ -34,6 +34,7 @@ class CourseWaffleFlagsViewTest(CourseTestCase):
         "use_new_certificates_page",
         "use_new_textbooks_page",
         "use_new_group_configurations_page",
+        "use_react_markdown_editor"
     ]
 
     other_expected_waffle_flags = ["enable_course_optimizer"]
@@ -71,7 +72,11 @@ class CourseWaffleFlagsViewTest(CourseTestCase):
         """
         for flag in flags:
             WaffleFlagCourseOverrideModel.objects.create(
-                waffle_flag=f"contentstore.new_studio_mfe.{flag}",
+                waffle_flag=(
+                    f"contentstore.new_studio_mfe.{flag}"
+                    if flag != "use_react_markdown_editor"
+                    else "contentstore.use_react_markdown_editor"
+                ),
                 course_id=self.course.id,
                 enabled=enabled,
             )

cms/djangoapps/contentstore/toggles.py

@@ -219,6 +219,22 @@ def use_new_custom_pages(course_key):
     """
     return ENABLE_NEW_STUDIO_CUSTOM_PAGES.is_enabled(course_key)
 
+# .. toggle_name: contentstore.use_react_markdown_editor
+# .. toggle_implementation: CourseWaffleFlag
+# .. toggle_default: False
+# .. toggle_description: This flag enables the use of the Markdown editor when creating or editing problems in the authoring MFE
+# .. toggle_use_cases: opt_in
+# .. toggle_creation_date: 2025-4-11
+# .. toggle_tickets: https://openedx.atlassian.net/wiki/spaces/OEPM/pages/4517232656/Re-enable+Markdown+editing+of+CAPA+problems+to+meet+various+use+cases
+ENABLE_REACT_MARKDOWN_EDITOR = CourseWaffleFlag(
+    f'{CONTENTSTORE_NAMESPACE}.use_react_markdown_editor', __name__)
+
+
+def use_react_markdown_editor(course_key):
+    """
+    Returns a boolean if new studio custom pages mfe is enabled
+    """
+    return ENABLE_REACT_MARKDOWN_EDITOR.is_enabled(course_key)
 
 # .. toggle_name: contentstore.new_studio_mfe.use_new_schedule_details_page
 # .. toggle_implementation: CourseWaffleFlag

xmodule/capa_block.py

@@ -340,6 +340,11 @@ class _BuiltInProblemBlock(
                "or to report an issue, please contact moocsupport@mathworks.com"),
         scope=Scope.settings
     )
+    markdown_edited = Boolean(
+        help=_("Indicates if the problem was edited using the Markdown editor in the Authoring MFE."),
+        scope=Scope.settings,
+        default=False
+    )
 
     def bind_for_student(self, *args, **kwargs):  # lint-amnesty, pylint: disable=signature-differs
         super().bind_for_student(*args, **kwargs)