* The maximum of users to be displayed raised from 30 to 100. This is
  consistent with the legacy users selector available via enrolment
  methods page.
* If there are more users found matching the search criteria, notify the
  user instead of displaying them. This is to prevent false impression
  that there are only that many users.
* Added behat tests for the new behaviour.

Custom AJAX handlers for the form autocomplete fields can now optionally
return string in their processResults() callback. If a string is
returned, it is displayed instead of the list of suggested items.

The string is displayed same way as we inform about no available
suggestions.

The original patch was overwriting grading methods navigation.

All credit goes to Andrew Nicols.

AMOS BEGIN
    MOV [searchhelp,moodle],[coursesearch_help,moodle]
AMOS END

Lost the uploading file when user press Submit before upload process has done

Thanks to Renaat Debleu for their contribution to this solution.

In cases when filepicker support is enabled, this patch adds a wrapper
div around the url element and includes the filepicker id in its id.
This allows the js callback code to target the specific input field
with which it is associated.