public/theme/UPGRADING.md
The manual completion button and activity dates have been moved to the activity header to improve visibility and proximity to the activity name. A new theme layout option, activityinfoinheader, has been introduced to control this behaviour and is enabled by default. Themes that set activityinfoinheader to false must manually override the relevant template (such as activity_header or activity_info) to ensure the completion information and the activity dates are displayed correctly.
For more information see MDL-87662
The core_courseformat\base class now includes set_show_restrictions_expanded() and get_show_restrictions_expanded() to allow course formats to define whether restrictions are displayed as expanded (defaulting to collapsed).
For more information see MDL-87929
These icons are no longer in use and have been deprecated:
core:t/blocks_drawercore:t/blocks_drawer_rtlcore:t/index_drawerFor more information see MDL-88085
These icons are no longer in use and have been deprecated:
For more information see MDL-85436
Added a new \renderer_base::get_page getter method.
For more information see MDL-81597
New core/context_header mustache template has been added. This template can be overridden by themes to modify the context header.
For more information see MDL-81597
The method \core\output\core_renderer::render_context_header has been deprecated please use \core\output\core_renderer::render($contextheader) instead
For more information see MDL-82160
Removed all references to iconhelp, icon-pre, icon-post, iconlarge, and iconsort CSS classes.
For more information see MDL-74251