Highlight background depending on number of tracks existing on frame. This is not so much mathematically accurate displaying where things shall be improved, but it's nice feedback about which frames better be reviewed. Bad frames are tracks < 8, highlighted with red. OK-ish frame are 8 <= tracks < 16, highlighted with yellow. Could be some artifacts with color region start/end, this is a bit unclear what exactly expected to be highlighted -- frames are displayed as dots, but in fact they're quite noticeable segments. --- svn merge -r54572:54573 ^/branches/soc-2011-tomato