Last modified: 2014-11-10 11:13:26 UTC
Windows can take a while to load with transplantStylesheets in slower browser, or if the window itself has a complex setup function. However there is no visual cue that the window is loading until this is complete. Clicking on a button and having nothing happen for a second or two is a bad UX.
Change 171823 had a related patch set uploaded by Catrope: Show the modal overlay as soon as openWindow is called https://gerrit.wikimedia.org/r/171823
Change 171823 merged by jenkins-bot: Show the modal overlay as soon as openWindow is called https://gerrit.wikimedia.org/r/171823