id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc,focuses 33287,Prompt the user before leaving during core upgrade,helium-3,,"Yesterday I was updating a test site (from 4.1.x to 4.2.x) using update-core.php and I accidentally clicked 'back' button during installation, which aborted the update process when it wasn't finished yet. This resulted in breaking the site completely (call to undefined function wp() ). It could have been easily prevented by simple beforeunload prompt.",enhancement,new,normal,,Upgrade/Install,4.1.6,normal,,,,"javascript, administration"