Merge pull request moodle#1420 from ferranrecio/MDL-80295-main

MDL-80295 documenting changes in the activity chooser.

Author: ferranrecio

docs/devupdate.md

@@ -43,3 +43,13 @@ The `maxsections` setting in course formats is now deprecated. Previously, this
 Although the `maxsections` setting remains available for now, it is marked as deprecated and will be removed in Moodle 6.0. Also, the `get_max_sections` from `core_courseformat\base` is also deprecated and will be removed in Moodle 6.0.
 
 If your format plugin relies on `maxsections`, you should add a custom setting in your plugin to control section limits. For reference, see the week format plugin, which now uses its own setting for this functionality.
+
+## Course format: new activity chooser rendering
+
+<Since version="5.1" issueNumber="MDL-80295" />
+
+The activity chooser in course formats has been refactored to use a new rendering approach. It now includes additional attributes such as `data-section-id` and `data-returnsectionid`, and the course renderer method for the activity chooser has changed.
+
+This update primarily affects format plugins that customize section or activity card rendering. If your plugin calls `course_section_add_cm_control`, you should update it to use the new `section_add_cm_controls` method.
+
+For themes that override activity chooser templates, ensure that the activity chooser button includes the required `data-section-id` and the `data-returnsectionid` attributes.