Make closed milestones visible in the milestones dropdown list
We currently only list the opened milestones, but sometimes you need to search and filter the closed milestones as well. Take for example the query below for the 8.12 milestone: https://gitlab.com/gitlab-org/gitlab-ce/issues?milestone_title=8.12&scope=all&state=closed. If you do patch releases like we do, the only way to set the correct milestone is through the chat commands, and even then closed milestones do not appear in the autocomplete dropdown.
Maybe we could list the opened milestones first which usually aren't more than 5, and then have a little text appear "Closed milestones" and below it list the closed milestones.