* Added aria-label for category single select element when on Courses
view mode.
* Fix correct labelling of custom control checkboxes. Instead of adding
aria-label in the label element, add an sr-only span within the label.
* Remove inappropriate 'group' role for the list of courses.
The list of courses is not being rendered as a tree structure
so adding a 'group' role to the list of courses is not really
necessary.
* Add aria-label for the search courses field.
* Add legend for the search courses fieldset.
* Use the primary colour for the category selection highlight instead
of the info colour.
* Changed the labels for the up/down icons using moveup/movedown
lang strings.
With this change the modal can be configured to be scrollable or not.
If enabled to be 'scrollable', the modal's body will become scrollable
when the modal's height exceeds the browser's height. This is useful
in cases where the content in the modal is quite large and extends the
modal beyond the browser's height, which usually results in a bad UI.
If 'scrollable' is not explicitely configured, it will be set as 'true'
by default as in most cases it would be the expected behaviour.
Without this index every webservice call will do a full table scan
when it tries to validate a token. On a busy site with many tokens
this adds unnecessary load to the database.
The `core\plugininfo\base::is_enabled()` uses three-state logic for its
return value. It can return null as a valid value as per its
documentation. We need to test for the explicit false value in this
case.
To make the attached Behat test able to identify the table, the caption
is added. It seems to be helpful for all users so I leave it displayed
without using the accesshide mechanism.
Where an element, like an `alert`, is closed it is removed from the DOM
before the event fires (this is a correct behaviour).
This means that the final event confirming that the action happened
(i.e. close => closed) fires, but does not bubble up the DOM to the
document.body.
This change moves the end event listener to only be added after a start
event has been fired, and to attach directly to the HTMLElement where it
will be fired. This means that the Event handler will still be called,
even though it has been removed from the DOM, because it does not need
to bubble up to the body.
