BUG: Fix handling of right_mouse_down() in RangeSelection2D
BUG: Fix handling of right_mouse_down() in RangeSelection2D

burnpanck/chaco,tommy-u/chaco,burnpanck/chaco,tommy-u/chaco,ContinuumIO/chaco,ContinuumIO/chaco,ContinuumIO/chaco,ContinuumIO/chaco,tommy-u/chaco,burnpanck/chaco