mozilla/butter — pull request #1026 by secretrobotron (2012-09-25 16:13:49+00:00)
Title: [t2347] trackevent deletion protection hardening

1. Added resizing and uiInUse properties to TrackEvent.
2. Used uiInUse in place of checking for other properties.
3. Prevent deletion if uiInUse is true (drag/resize).
4. Delete all events if deletion actually occurs.