Hello,

Please find a (very useful ;-)) patch for highlighting (in the mode-line) the
tags which are used to filter the agenda.

I'd like even to be able to put in one color the "positive" tags and in
another the "negative" ones, but that's above my current knowledge of
text-properties...

Anyway, here is a usable first version -- where all tags are in the same
color, much more easily to spot (before you wonder why you have so few lines
in your agenda!).

Best regards,
  Seb

-- 
Sebastien Vauban