silverstripe/sapphire — pull request #952 by stojg (2012-11-15 02:51:38+00:00)
Title: BUG Video embed from Add Media Feature no longer works (open #8033)

Since the tinymce upgrade from 3.5.6 to 3.5.7 it seems like data attributes are forbidden on tags.
This fix tells tinymce to allow data* properties on img tags