paging_bar previous/next buttons have wrong page numbers

Requirements A course with at least 100 enrolments. Can use: php admin/tool/generator/cli/maketestcourse.php --shortname=MDL-68427 --size=S Testing Apply the attached patch ( 0001-DO-NOT-COMMIT.patch ): git am /path/to/0001-DO-NO-COMMIT.patch View the course page Choose "Participants" from the drawer on the left Edit the URL by changing the perpage=20 to perpage=5  or add &perpage=5 if the parameter is missing and ensure you press enter to load the page Confirm that the pagination links show the current page as page 1 *Confirm that there is no "Previous page" button (with a label like << ) Confirm that the "Next page" button is labelled ">> (2)" Confirm that there is a "Last page" which just as the final page number after a ... Click on the Next page button Confirm that the pagination links show the current page as page 2 Confirm that the "Previous page" button is labelled "<< (1)" Confirm that the "Next page" button is labelled ">> (3)" Confirm that there is a "Last page" which just as the final page number after a ... Click on the "Last page" button Confirm that the pagination links show the current page as the number that you clicked Confirm that the "Previous page" button is labelled "<< ( [previous page number] )" Confirm that there is no "Next page" button Confirm that there is a "First page" which just as "1" and that there is a ... marked before another page number