When the instructor saves a permission change in the Roster's permission table, they click Save.
When editing and saving changes in the Permissions chart for all other tools I've tested, the Save action displays a spinner to indicate the changes are being saved and then the screen resets to the tool's landing page.
In the Roster tool, however, clicking Save simply displays a "Permissions saved" message and the tool does not reset to the landing page.
In the interest of providing our users the same (and thus predictable and reliable) experience throughout the whole of Sakai, this tool should behave as the other tool Permissions interactions do.
Tested on https://trunk-mysql.nightly.sakaiproject.org, which was the only version that had this different behavior.