This files describes API changes in /theme/* themes,
information provided here is intended especially for theme designer.

=== 2.4 ===

required changes:
* output course and course content header/footer that may be returned by course format (see MDL-36048)
* span.completionprogress has been changed to a <div> and is not a float by default any more.

deprecation:
* i/roles: Use t/assignroles instead
* t/manual_item: Use i/manual_item instead
* t/unlock_gray: Use t/locked instead
* t/userblue: Previously used to unblock a user, use t/unblock.
* c/course: Use i/courseevent instead
* c/group: Use i/groupevent instead
* c/site: Use i/siteevent instead
* c/user: Use i/userevent instead
* t/clear: Use t/check instead
* i/cross_red_big: Use i/invalid or i/grade_incorrect
* i/tick_green_big: Use i/valid or i/grade_correct
* i/tick_amber_big: Use i/caution or i/grade_partiallycorrect
* No more small versions of i/cross_red_small, i/tick_green_small and i/tick_amber_small, use their big equivalent.
* t/addgreen: Use t/add instead.
* i/approve: Use t/approve instead

optional changes:
* new optional boolean parameter $withlinks for public function login_info() in lib/outputrenderers.php (MDL-31365)
* new layout option "nologinlinks" and new page layout "secure" e.g. for safebrowser and securewindow (MDL-31365)
* new class 'iconlarge' for 24x24 icons.
* new icons i/export and i/import (sized 16x16). Previously export and import actions used i/backup and i/restore.
* new icon i/assignroles (sized 16x16), to prevent the use of i/roles which is 12x12.
* new icon i/switchrole (sized 16x16), was previously using i/roles. Now is a copy of the new i/assignroles icon.
* new icons i/enrolusers and t/enrolusers, previsouly i/users was used.
* new icon t/cohorts (sized 12x12), to prevent the use of i/cohorts which is 16x16.
* new icons t/sort_asc, t/sort_desc to use for ordering in table headers.
* new class 'iconsort' for icons used for ordering in table headers.
* new icons t/locked and t/unlocked (12x12) which should be used when there is no action associated to the icon.
* new icons i/folder (16x16), monochrome equivalent to f/folder.
* new icons t/addcontact, t/removecontact and t/messages, previously t/addgreen, t/delete and t/log were used in messaging.
* new icons t/unblock and i/twoway.
* new icons i/courseevent, i/groupevent, i/siteevent and i/userevent (16x16) instead of c/* for calendar events.
* new icon t/markasread (12x12) to replace t/clear used in forums.
* new icon t/check (12x12) to replace t/clear which name does not reflect the icon meaning.
* new classes 'icon-pre' and 'icon-post' supposedly to be used when the icon is positioned before or after the text. This is not really used yet, but it's a start towards some standardisation of the icon selectors.
* new icons i/valid, i/caution and i/invalid for generic statuses.
* new icons i/grade_correct, i/grade_partiallycorrect and i/grade_incorrect for grades.
* new icon t/approve (12x12).
* new icon t/contextmenu (12x12) for a monochrome version of i/menu.

=== 2.3 ===

optional changes:
* add new u/f3.png image when theme contains customised f1 and f2 default user images

=== 2.2 ===

required changes:
* use new page content placeholder "echo $OUTPUT->main_content()" instead of "echo core_renderer::MAIN_CONTENT_TOKEN"
  see git commit: 3b3f302855d7621405a8b93e49bd399d67a998d7
* upgrade report selectors: search for "-course-report-" and replace with "-report-"
