Intro
As far as I can tell it is required to restart magic to refresh the Library Manager. I.e. after running select save some_new_cell, some_new_cell does not appear in the Library Manager, even if it is closed and re-opened. One must restart magic entirely to have it update.
Feature Request
Have the Library Manager refresh, ideally whenever focus is returned to it, or perhaps at a minimum when it is re-opened.