Milestones creating -> loosing all milestone data
When creating a milestone having referred a user directly by username using @old-fart per example, and going to the "Preview" pane/tab to check on changes/verify markdown formatting, you loose ALL previously entered data if you click (accidentaly or not, yes) on the @old-fart link as you are being redirected to the user's page without a modified page notification.
On my end and on 3 different computers (lubuntu 14.04, mint xfce 17.3, lxle 14.04) all running Firefox, i would loose whatever data i had entered each time. I have not tested with any other type of external redirecting link.
It affects milestone creation but as i just tested, doesn't affect New issue creation.
There should be a confirmation request about modified data and leaving the page.