mozilla/butter — pull request #1203 by mjschranz (2012-10-18 14:03:49+00:00)
Title: [#2596] Prevent top resizing from allowing element to be positoned out of the video

https://webmademovies.lighthouseapp.com/projects/65733/tickets/2596-top-and-left-resize-handles-for-track-event-editors-can-drag-content-out-of-container