Graph Editor: Draw indicators on the active Driver F-Curve which show the
relationship between the result of driver evaluation (NKEY region stuff) and the
end result applied to the driven properties.

Example:
http://www.pasteall.org/pic/47687




git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55489 954f8c5b-7b00-dc11-b283-0030488c597c