message: Add todo note from dri-devel
diff: Fix overwriting rows: Ie, adding a row named gfx
  + From https://people.freedesktop.org/~cbrill/dri-log/?channel=dri-devel&highlight_names=&date=2017-09-19&show_html=true
  + > 12:35 hanna: Speaking of gpuvis, it would also be cool to be able to extend the
  + > "print" line, using a standardized format. I want my events to show up as
  + > separate rows in the graph, and I also want to be able to define "begin" and
  + > "end" events which gets translate into bars in gpuvis
  +
  Check if entire rows are clipped when drawing...
  Feedback:
  